Comsol topology optimization

Last UpdatedMarch 5, 2024

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In 2022, Acculution designed a phase plug for an acoustic waveguide for a (client’s) loudspeaker application purely via acoustic topology optimization, and this is seemingly the first in the world. The globally convergent version of the solver is often referred to as GCMMA. The resulting design is verified in 3D, and a STL file is exported. Learn how to optimize multiphysics models with the Optimization Module, an add-on to COMSOL Multiphysics ®. Topology optimization is technique where a certain optimization domain is defined, and within this domain a single design variable can take on values between 0 and 1 continuously. To achieve the multiphysics multi-material optimization, density method with consideration of handling different materials was used for topology optimization of the device. There’s a new book out there for those of you who work with or research electromechanical system design. spf2. Failed to evaluate variable. The pressure acoustics interface in frequency domain in COMSOL was used for this investigation. Finite Elements in Analysis and Design 44 (2007) 53–62). Micro cooling channel heat sinks designed by topology optimization. Step thrust bearings are used for supporting axial loads in rotating machinery, and because the load capacity depends on the geometry, you can use shape and topology optimization to maximize the load capacity of the bearing. This is achieved through a series of iterations where specific design aspects are varied, such as the dimensions, material properties, operating conditions, etc. Hello,When iam using the optimization solver to solve a topology optimization problem of eigenfrequency with MMA argorithm,i find i can not chose a study step of eigenfrequency ?and this question is really hindering my optimization. Design variable field γ: 0 solid; 1 void. Adequate representation of geometry. COMSOL Moderator. The coupled fluid-thermal model of a heat sink cooled with forced convection is implemented in COMSOL Multiphysics® software as well as a three-field density-based topology optimization. Application ID: 98011. In reviewing the model settings, we focus on the use of probes, the significance of the scale of the parameters, the effect of scaling on objectives, and the weighted objective functions. The Jul 30, 2020 · I have a 2D model where there's a design domain which is designated for Topology Optimization. Abstract: In this paper, topology optimization is applied to optimize the cooling performance of thermal heat sinks. In Part 2 of this course on optimization, we start by picking up where we left off in Part 1, where we built and computed a model of a microresistor beam. If you do have that module, then its documentation and built-in tutorials should be quite helpful towards building your models Apr 20, 2018 · Topology optimization. The optimization is formulated as a mean temperature minimization problem controlled by Navier-Stokes (N-S) equations as well as energy balance and linear elasticity equations. The optimality criterion is a minimum compliance The coupled two-dimensional thermofluid model of a heat sink cooled with forced convection and a density-based topology optimization including density filtering and projection are implemented in COMSOL Multiphysics. 2. com/paper/numerical- Topology optimization was used to minimize the heat sink’s temperature. The optimization problem is solved using GCMMA and continuation in the topology optimization parameters. Undefined variable. The resulting 3D geometry (shown below on the right) is a cube with a horizontal cylinder The model studies optimal material distribution in the beam, which consists of a linear elastic material, structural steel. The resulting design is post-processed using shape optimization, where the maximum stress is constrained using a stress aggregation function. 4, the add-on Optimization Module includes a density topology feature to improve the usability of topology optimization. Acoustic Metamaterial Cloaking involves pressure acoustic modelling and topology optimization. I want to use the Heat transfer and optimization tool. Welcome to the Optimization Module User’s Guide. Topology Optimization. Multi-objective optimisation of a thermal compliance/viscous dissipation problem is additionally performed. Today, guest blogger René Christensen of GN Hearing discusses including thermoviscous losses in the topology optimization of microacoustic devices. As of COMSOL Multiphysics® software version 5. The third study begins with a two-step topology optimization, always seeking the highest possible BL and starting from a “full” cylindrical annulus with an iron volume of about 52 cm 3. The The Optimization interface and Optimization study step in COMSOL Multiphysics® are useful for solving design problems as well as inverse problems and parameter estimation. " / "Forward solution failed: requesting reduced step. In this work, topology optimization including density filtering and projection is applied to optimize the cooling performance of thermal heat sinks. Topology optimization helps engineers design applications in an optimized manner with respect to certain a priori objectives. In this model we show how to design a set of compliant pliers using topology optimization. The entire assembly is submerged in a lubricant. This is a reference guide on simulation and topology optimization written with both May 12, 2021 · Multi-material topology optimization. Hello xiangdong li May 24, 2019 · Using COMSOL Multiphysics and a combination of the Acoustics Module and the Optimization Module, the research team was able to implement their optimization scheme with key variables and parameters, including the “pamping” function mentioned previously. As a key component of MEMS, microprocessor with high computing performances is facing with severe thermal challenge due to the increasing Performing Optimization in COMSOL Multiphysics. OPTIMIZATION ALGORITHMS There are three optimization algorithms for gradient-based optimization available in the Optimization Module. This example shows how to perform a topology optimization with several load and constraint cases. A p-norm is used to produce an aggregated field for use with standa. PDT. 1. MMA tends to be braver in the beginning, proceeding quickly toward an approximate optimum. Mar 9, 2022 · I tried to apply topology optimization to magnetic fields in 3D in specific working with coils. Thus making this approach particularly interesting from an engineering generated through COMSOL fluid-flow topology optimization studies, where the goal was to minimize the pressure drop across the manifold while balancing the flow rate to each outlet nozzle. Hello Aravind K. The flow rates across all nozzles are within 7 percent of each other and the pressure drop is about 2 kPa, meaning Oct 16, 2020 · In the present study, a topology optimization method of thermal-fluid-structural problems is researched to design the three-dimensional heat sink with load-carrying capability. The COMSOL Multiphysics® software supports efficient and automatic calculation of sensitivities for arbitrary objective functions. Topology optimization is a powerful tool that enables engineers to find optimal solutions to problems related to their applications. The particular model solves the problem of finding the optimal distribution of a given amount of material forming an L-shaped frame. However, there are some additional steps for 2D geometries. Density-based topology optimization. Optimal material distribution in given design domain. Dec 18, 2021 · Topology Optimization (TO) is a process that optimizes material layout and structure within a given 3D geometrical design space for a defined set of rules set by the designer. , only the position of the mesh nodes changes. This can be achieved using equation-based modeling and extrusion operators. This is the default, but the original version of the MMA algorithm is also available. A detailed introduction to topology optimization can be found in our blog post “Performing Topology Optimization with the Density Method”. COMSOL 6. Various physical process including conduction, convection-diffusion, and Navier-Stokes flow are implementation in COMSOL Multiphysics. locCFL. Image courtesy Fritz Lange. The dimensions of the beam region — 6-meters by 1-meter by 0. Problem relaxed to γ values between 0 and 1 Gradient-based optimization possible. e. mph. , in order to meet an objective, such as the performance of a design, the need to fall under a specific criteria, etc. Jan 4, 2019 · As of COMSOL Multiphysics® software version 5. The module provides tools for parameter, shape, and topology optimization, as well as parameter estimation. Your Discussion has gone 30 days without a reply. Sep 26, 2021 · An effective and straightforward method to implement topology optimization using high-level programming is presented. Building model based on article from COMSOL Conference in Lausanne 2018: https://www. The coupled two-dimensional thermofluid model of a heat sink cooled with forced convection and a density-based topology optimization including density filtering and projection are implemented in COMSOL Multiphysics. Jan 24, 2020 · How to Generate a Geometry of Topology Optimization Results in COMSOL Multiphysics® The steps to generate a geometry of topology optimization results using a Filter dataset is the same for 2D and 3D geometries as of COMSOL Multiphysics version 5. A guest blogger from GN Audio A/S introduces a multiphysics topology framework developed with the COMSOL Application Programming Interface and LiveLink™ for MATLAB®. Jul 7, 2014 · July 7, 2014. Jan 3, 2017 · optimization solver;topology. I found problems in the study using the combination of Coil Geometry analysis and topology optimization. The method uses the LiveLink for MATLAB, which couples the commercial COMSOL Multiphysics software with MATLAB programming environment via COMSOL Application Programming Interface (API). I already found the toplogy optimization case files in the applications library, all of them are about structural topology Optimization Module Updates. Today, guest blogger René Christensen of GN Hearing discusses the importance of acoustic topology optimization and how to apply it in COMSOL Multiphysics. Topology optimization was used to minimize the heat sink’s temperature. comsol. The final optimized geometry is exported and then imported for a verification analysis in which the now void domain is excluded. 6 brings a new optimization solver (IPOPT), the ability to save intermediate solutions for gradient-based optimization, and automatic objective function scaling. Therefore, distribution of two materials in the design space was considered and density of the materials were used as design variables for the optimization problem. In the Model Builder window, Ctrl-click to select Parameter Optimization and. The framework is demonstrated with an acoustic–structure interaction (ASI) problem, which can be solved using the May 6, 2021 · 3D FSI Topology Optimization. 5 for the entire domain, and during the optimization process the domain will preferably consist of binary values; either 0 or Feb 28, 2018 · February 28, 2018. For users of the Optimization Module, COMSOL Multiphysics ® version 6. Sep 23, 2015 · While topology optimization may have initially been built for a mechanical design, the penalization method can also be applied to a large range of physics-based analyses in COMSOL Multiphysics. Extracting the optimized design for validation. - Geometry: geom1. Click. The reason is that the solution does not have to be computed for a large Go to the Add Physics window. Do you know some hints that I should consider to simulate topology optimization in 3D for magnetics fields for coils?. Hello Young You. The classical MBB beam is solved in 2D using a Helmholtz filter and Solid Isotropic Material Penalization (SIMP) technique to recast the original combinatorial optimization problem into a continuous optimization problem. In the table, clear the Solve check boxes for Study 1 - Initial Design, Study 2 - Topology Optimization, and Study 3 -Optimized Spectrum. The feature is designed to be used as a density method ( Ref. Learn more about this model in the accompanying blog post: "A Practical Implementation of Multiphysics Topology Optimization". Heat is generated in the domain with Heat Transfer interface and fluid flow past it is governed by Laminar Flow interface. In recent years, COMSOL has evolved its Optimization Module to a point where it is now possible to apply the academical learnings in the industry. This example considers the case of a torsion sphere which is known to feature a closed ball as the optimal design, but the introduction of milling constraints leads to a ball with four holes. The built-in functionality of the COMSOL Multiphysics ® software allows for solving these problems with gradient-based optimization. The Polynomial Boundary feature is one of them. Nov 3, 2016 · Topology optimization in COMSOL Multiphysics for static structural mechanics was a previous topic of discussion on the COMSOL Blog. Both its ends rest on rollers while an edge load acts on. In the Geometry toolbar, click Insert Sequence and choose Insert Sequence. A Tesla microvalve inhibits backward flow using friction forces rather than moving parts, and therefore the objective is to maximize the average flow rate. SNOPT is more cautious, but converges more efficiently close to the final solution due to its second-order approximation of the objective. The optimization objective is to minimize the heat sink’s temperature for a prescribed pressure drop and fixed heat generation. Jan 22, 2024 · This blog post demonstrates how to maximize the lowest eigenfrequency using shape and topology optimization so that the likelihood of resonance can be reduced. Application ID: 43511. Published in 2018. Advantages of topology optimization. m. 1). This model demonstrates 3D topology and shape optimization for an extruded geometry. Open. It can solve min-max optimization problems, and it is well suited to handle problems with a large number of control variables, such as topology optimization. The integrated environment allows one to implement advanced and customized functions and May 6, 2021 · 3D FSI Topology Optimization. We then provide an overview of the settings in the Parameter Estimation study step before moving on to topology optimization. my objective function is maximum heat transfer by my pre-defined geometry and constrains is temperature should be less COMSOL LiveLink for MATLAB enables us to couple the commercial COMSOL Multiphysics software with MATLAB programming via COMSOL Application Programming Interface(API). Shape optimization works by changing the shape of the steps in the bearing, whereas topology general form as SNOPT. During creation of the model I have faced with the following problems: 1. To simplify this step, insert a prepared geometry sequence. In the Geometry toolbar, click Build All. The model considers stiffness maximization of a beam subject to a constraint on the mass, but the method can be used with any variant of the stationary and Sep 10, 2020 · Topology optimization can be performed with COMSOL's Optimization Module. Hao Li [1], Xiaohong Ding [1], Dalei Jing [1], Min Xiong [1], [1] University of Shanghai for science and technology. This presentation shows a level set-based topology optimization method for the structural design of negative permeability dielectric metamaterials incorporating the level set boundary expression based on the concept of the phase field method, and its optimization algorithm implemented by COMSOL Multiphysics. The acoustic wave propagation in cloak is governed by the wave propagation equation. PARAMETER OPTIMIZATION, SHAPE OPTIMIZATION. The beam is symmetric about the plane x 3. Hello Everyone, I am a student and a beginner, I want to shape optimization or Topology optimization of a 3D geometry. The What is topology optimization? Originated in structural mechanics. Using the density method is the most common approach for performing topology optimization, and it’s implemented in the Density Model feature in COMSOL Multiphysics. Optimization Module Updates. Hi, I am trying to understand how comsol solves the topology equations using navier stokes equations. In the tree, select Acoustics>Pressure Acoustics>Pressure Acoustics, Frequency Domain (acpr). Optimization Algorithms The Optimization Module contains the framework and functionality needed to perform gradient-based and gradient-free optimization on an existing COMSOL model. Download Files. Loading The model demonstrates how to use the built-in milling constraints in the Density Model feature. I have followed every tutorial on 2D topology optimization and recreated the 3d hook example, however when I apply all of the steps to the shell element, no material is being removed and the process stops after 2 iterations without any changes and no errors. 3 ), meaning that the control parameters change a material parameter through an interpolation function. 3D FSI topology optimization domain (a), 3D solution for minimum structural compliance with fluid velocity streamlines (b), and different views of 3D optimized structure (c) under laminar flow The designs can be easier to manufacture by using milling constraints, at some cost to the performance. and when I start the simulation, it alwasys shows the following mistakes. Continuation in the convexity parameter Nov 15, 2019 · The COMSOL Multiphysics® software supports gradient-based shape optimization by fixing the mesh topology; i. Find the Physics interfaces in study subsection. May 31, 2022 · Introduction to COMSOL Multiphysics, part 1. November 3, 2016. - Variable: CFLCMP. The result is verified with a body-fitted mesh and compared to a simple design. Through topology optimization, they found new Sep 16, 2022 · This blog post introduces a multiphysics topology optimization framework with the COMSOL Application Programming Interface (API) and LiveLink ™ for MATLAB ®, published in Structural and Multidisciplinary Optimization, (Ref. While topology optimization may have initially been built for a mechanical design, the penalization method can also be applied to a large range of physics-based analyses in COMSOL Multiphysics. In the Geometry toolbar, click Insert Sequence. Loading The PDE based nature of the Helmholtz This model demonstrates how you can apply the SIMP model (Solid Isotropic Material with Penalization) for structural topology optimization with COMSOL Multiphysics. Setting the Filter type to None to see the effect of filtering. This will subsequently increase electrode effective capacity and overall LIB performance for further commercial applications. Jul 31, 2023 · The reason I want to use COMSOL is because I have an existing topology optimization that relies on coupled structural and magnetic physics modules, but it can only decide between two materials. This example performs a topological optimization for a Tesla microvalve for an oscillating pressure drop. ®. Resolving mesh sensitivity. The flow is pressure driven and the objective is to maximize the heat transfer. 2021). We encourage you to follow along with us step by step in the software, using the microresistor_beam_start model file, as we perform parametric From the File menu, choose Application Libraries. 5 meters — means an original total weight of 23,550 kg. Click the. I want to use multiphysics. Apr 18, 2019 · The heat sink designs generated by parametric (left) and topology (right) optimization. Introduction to Mechanical Resonance The problem is solved using topology optimization with milling constraints. This is crucial for gradient-based optimization, and thus all topology optimization. Mar 26, 2021 · This video provides a brief overview of COMSOL Multiphysics, focusing on the mechanical modeling tools and optimization capabilities offered by the software. Jun 3, 2020 · Topology Optimization. The Optimization Module, as of COMSOL Multiphysics version 5. A Sep 16, 2022 · This blog post introduces a multiphysics topology optimization framework with the COMSOL Application Programming Interface (API) and LiveLink ™ for MATLAB ®, published in Structural and Multidisciplinary Optimization, (Ref. In 2022, Acculution designed a phase plug for an acoustic waveguide for a (client's) loudspeaker application purely via acoustic topology optimization, and this is seemingly the first in the world. GEOMETRY 1. The capabilities of the Optimization Module can be used in conjunction with any combination of other COMSOL products. Shape Optimization. Keynote: Topology Optimization for an Efficient Design of an Electric Motor. Jul 21, 2010 · A simple evolutionary topology optimization procedure for compliant mechanism design. , in order to meet an objective, such Using Parametric Sweeps to Perform Optimization. The model solves much faster using this combination of optimization and time dependent solver compared to when using the time dependent solver alone. Various physical process including conduction, convection-diffusion, and Navier-Stokes flow are Dec 16, 2022 · A Practical Implementation of Multiphysics Topology Optimization. The filtered material volume factor is use a source term in a set of convection equations. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for Feb 1, 2023 · The COMSOL Multiphysics ® software supports milling constraints, and in this blog post we will explain how to use such functionality and show examples. In a keynote talk at COMSOL Day: Vehicle Electrification, Steffen Rothe of Volkswagen Group Components shares how they use multiphysics simulation and optimization to design an electric motor with reduced magnetic weight. Suggested Products. Mainly used in structural mechanics, topology Welcome to the Optimization Module User’s Guide. This guide is a supplement to the COMSOL Multiphysics Reference Manual. " Oct 2, 2023 · Hi, I've been trying to topology optimize a 3D curved, uniformly loaded, simply supported, ultra-thin circular shell. Application ID: 105861. A first optimization is used to find the design of a nonlinear iron pole piece and top plate that maximize the BL factor at the resting position (small displacements), while constraining the amount of iron used. Dear All, Hello! I am simulating multi-material topology optimization, which limits the geometry structure but changes the stiffness by multiple materials distribution in geometry. To give a brief overview: A so-called MBB beam is investigated with the objective of maximizing the stiffness by minimizing the total strain energy for a given load and boundary conditions. The framework is demonstrated with an acoustic–structure interaction (ASI) problem, which can be solved using the Nov 3, 2016 · Guest. 3D FSI topology optimization domain (a), 3D solution for minimum structural compliance with fluid velocity streamlines (b), and different views of 3D optimized structure (c) under laminar flow This study uses a Level Set (LS) based Topology Optimisation (TO) approach to maximise the thermal performance of 2D and 3D heatsink designs. I would like to use one-way coupling with the fluid flow Aug 2, 2023 · Can COMSOL perform topology optimization for constrained damping layers ? 0 Replies Last Post Aug 2, 2023, 7:21 p. Changing the mesh refinement. One material has a relative permeability of 1 but a lower Young's modulus, while the other has a relative permeability > 1, but a higher Young's modulus. Our Minimizing the Flow Velocity in a Microchannel tutorial, for instance, provides an example of flow optimization. September 16, 2022. In the Application Libraries window, select Optimization Module>Design Optimization> beam_optimization in the tree. This work demonstrates that COMSOL Multiphysics offers the possibility to use the topology optimization method including density filtering and projection with relatively little implementation effort. changes in topology) can be introduced, but circular holes should retain their shape and positions (geometric contraints). Thus making this approach particularly interesting from an engineering A demonstration of topology optimization using the Structural Mechanics Module and the Optimization Module. Feb 1, 2023 · The COMSOL Multiphysics ® software supports milling constraints, and in this blog post we will explain how to use such functionality and show examples. Create the geometry. Optimization problems can be further categorized as topology, size, shape, and parameter optimization. Density Model is used to penalize fluid flow when density is present. Read more about these and other optimization features below. This model demonstrates topology optimization of a 2D heat exchanger with laminar flow. In order to prevent an unrealistic and low The solver modifies the initial conditions at the beginning of a period to match the solution at the end of the period. Application ID: 69891. . From there, we move on to a new example that performs topology optimization of a bracket. You'll want to check if your license includes that product; you can do so by going to File > Licensed and Used Products inside of the COMSOL GUI. Implementing topology optimization schemes in future works is expected to aid in new design methods to increase resilience of highly stressed electrode surfaces. The basic idea is to introduce a spatially varying design variable field, \theta_c , that is bounded between 0 and 1, corresponding to void and solid material, respectively. Can anyone lease help me with these equations. Changing the control variable discretization element order to Constant. I think I set up the problem correctly but for some reason COMSOL optimization solver can never converge ("Returned solution is not converged. by Topology Optimization is the focus of this paper. This sounds like Nov 18, 2020 · Dear all, I am trying to do the topology optimization for heatsink with laminar flow. For users of the Optimization Module, COMSOL Multiphysics ® version 5. Specifically, COMSOL Multiphysics software is coupled with a method of moving asymptotes optimizer in a custom COMSOL / MATLAB script. Bracket — Topology Optimization. 5, comes with several built-in features for shape optimization. In addition to results demonstrated in the published paper, a 3D example of FSI topology optimization was also carried out. Numerical model The LS optimisation process is iterative in nature. Keywords: Acoustics, topology optimization, demultiplexer, mode converter, phase plug replaceab Introduction Topology optimization is a relatively new discipline in which one or more domains are assigned to be design domains; in these domains, one or more material properties are changed via the optimization Mar 22, 2018 · By adding an Optimization interface, you can further reduce the volume of the iron yoke while preserving a high magnetic performance. A step thrust bearing consists of a stepped bearing surface on which the end of the shaft rotates. - Domain: 1. Browse to the model’s Application Libraries folder and double-click the file. bracket_topology_optimization_stl_geom_sequence. In this section is a short Optimization Module Overview. The density method is used with the (now) classical approach of a single design variable and two flow interfaces. Gracias. This paper is focused on topology optimization of heat transfer and fluid flow systems for multiphysics objectives. The goal is to maximize part performance by mathematically modelling and optimizing for factors such as external forces, load conditions, boundary condition s Application ID: 75211. 5. In this work, we demonstrate a comprehensive COMSOL LiveLink for MATLAB code for topology optimization of conjugate heat transfer inspired from (Junghwan Kook et al. Feb 15, 2023 · During optimization shape of external rectangular boundary can be deformed and new holes (i. In this tutorial model, a step thrust bearing is topology optimized to maximize the bearing capacity. This model presents two examples of topology optimization of the magnetic circuit of a loudspeaker driver. For topology optimization, either the MMA or the SNOPT solver can be used. It’s titled Multiphysics Simulation: Electromechanical System Applications and Optimization and is more than your average textbook. 0 brings a Transformation feature for setting up simple shape variations, revamped parameter estimation functionality for least-squares objective analyses, improved support for transient optimization, and more easily accessible optimization features. - Variable: comp1. The density feature for topology optimization is used together with a parametric sweep where each optimized solution is used as input for a further improved optimization. Dec 19, 2023 · December 19, 2023. Optimization is the mathematical process of finding the optimal version of a design or process. The design can be optimized by distributing material within the modeling domain. Initially, one might choose a value of 0. They have different merits and weaknesses. oc rp wh gq xh jw wm vr uc gi