In this video, two dimensional heat transfer problem is solved using comsol multiphysics software. Formerly femlab, comsol is a finite element analysis software package for various engineering and physics applications, with special emphasis on coupled phenomena multiphysics. Mar 09, 2014 how to do a mesh convergence with comsol s built in settings alex warning. In addition to using multiphysics modeling for your own projects, you can also turn your models into simulation applications and digital twins for use by other design teams.
The convergence graph propertymanager sets the components to be plotted after a successful run of a static study using the padaptive method you can select any number of options. It provides an overview of the comsol environment with examples that show you how to use the comsol desktop user interface and the model builder. Search generating convergence graphs in the solidworks knowledge base. May 06, 2017 use simpsons rule to evaluate the integral of sinx3 from 0 to 2pi, and plot the convergence of the integral versus the number of sample points used. Dec 31, 20 the expression field for the zcomponent of the deformation plot contains the same quantity erexpjrev1phi and the other components are 0. By making the problem time dependent, you usually get a smoother convergence. In our previous blog entry, we introduced the fully coupled and the segregated algorithms used for solving steadystate multiphysics problems in comsol. User variable plot and oscillating convergence cfd online. How to do a mesh convergence with comsol s built in settings duration. Multiphysics analysis of inductive brazing process a. Complete product documentation can be found during the installation process or in the help menu when running the software. To report problems encountered with the web help interface and search, contact your local support representative. How to perform a mesh convergence study simulation.
Comsol provides an ide and unified workflow for electrical, mechanical, fluid, acoustics and chemical applications. The software then computes an initial solution and from there it iteratively. Make sure to solve the problem for large enough times, such that the solution does not vary any longer. All of these, in combination with each other, will affect solver convergence. Note that this quantity is complex and that by default comsol plots the real part. Use simpsons rule to evaluate the integral of sinx3 from 0 to 2pi, and plot the convergence of the integral versus the number of sample points used.
But surprisingly when i use a parametric range of wavelength, it is not running does not show proper convergence graph. Numerical demonstration of finite element convergence for. For more information regarding the process, search for mesh study. It allows conventional physicsbased user interfaces and coupled systems of partial differential equations pdes. Plot icon above the settings window and you will see your convergence plot. Comsol is one of the best software to date for multiphysics applications. Time dependent solver convergence comsol multiphysics. Plotting the algebraic residual to study model convergence. The comsol multiphysics time dependent transient solvers have the. Improving convergence of multiphysics problems comsol blog. Convergence plots comsol multiphysics modeling software.
How the smoothness of the bh curve affects the simulation. Visualization for 2d axisymmetric electromagnetics models. Comsol multiphysics is a crossplatform finite element analysis, solver and multiphysics simulation software. Yang department of mathematics and statistics, university of. Improving convergence of nonlinear stationary models comsol. Since the value of n represents the stage within newtons method, it may make more sense to plot it as the xvalue. How to perform a mesh convergence study this process is partially automated for cadbased, automeshed models and only for the static stress with linear material models analysis type. Comsol multiphysics alternatives and similar software. My doubt is about how i should configure the comsol software to obtain the electrostatic charge which is created because of the air.
Can someone explain to me what exactly the comsol convergence plots are showing me. Yang department of mathematics and statistics, university of maryland, baltimore, md, usa. Recall that the time harmonic ansatz in the comsol software assumes that the field components oscillate in time according to e. These release notes provide information regarding new functionality in existing products. Dunno what youre doing this christmas mornbut im debugging. The vertical axis is normalized to unity if multiple graphs are selected. How to customize the comsol desktop and use keyboard. Note that while comsol employees may participate in the discussion forum, comsol software users who are onsubscription should submit their questions via the support center for a more comprehensive response from the technical support team. Can someone explain to me what exactly the comsol convergence. My doubt is about how i should configure the comsol software to obtain the electrostatic charge which is created because of the air friction with the cylinder. Please anyone explain me the attached convergence plotswhat. In addition to using multiphysics modeling for your own projects, you can also turn your models into simulation applications and. Ideally, the error should go down monotonically if it does converge, then start investigating ramping the loads, the nonlinearities, or the multiphysics couplings. How to draw mesh convergence plot in comsol so that i can.
Convergence plot inventor autodesk knowledge network. Pandey1 1 honeywell technology solutions lab, bangalore, karnataka, india abstract the objective is to analyze temperature rise and distribution in different parts of an. How to draw mesh convergence plot in comsol so that i can check. Comsol multiphysics is designed to be an extremely flexible package applicable to virtually many areas of research, science, and engineering. The simulation is running very well for a single wavelength convergence plot shows a proper graph. It is very easy to learn provided one must know the underlying theory behind the simulation, i. Thus, comsol multiphysics has calculated the stationary solution. If the nonlinear solver has difficulty converging, it will reduce the requested. Suppose that we would like to plot the field quantities for a mode with m 1. The convergence plot of the simulation with a linear and constant bh curve extrapolation. How to plot quantities with different scales on 1 graph in comsol duration. Hi victor, it is difficult to provide a general answer to your question, but in my experience when the convergence plot shows as figure 2 slope having large change between solution steps, or a subsequent step displays a decreasing value it could mean the location of maximum stress where we are performing the inements is changing location on the model, or we are attempting to converge. How are convergence criteria set in comsol multiphysics.
At first i just plotted pressure loss, which worked fine, but now additionally i want to plot average inlet velocity and mass flow. When solving such a problem, you will get a convergence plot, which shows the error estimate decreasing between newtonraphson iterations. Comsol multiphysics is an engineering, design, and finite element analysis software environment for the modeling and simulation of any physicsbased system. Improving convergence in nonlinear time dependent models. Therefore the software will try to minimize reevaluating the jacobian, by default. Stationary timeinvariant models with nonlinearities may converge very slowly. Complete product documentation can be found during the installation process or. The primary criteria for determining convergence is that the change of each degree of freedom is minimized over a large range of iterations. The convergence plot for the turbulent flow over a backward facing step tutorial model. The convergence plot command displays the plot within a dialog box. How to do a mesh convergence with comsols built in. Plot and observe the solution at, and immediately before, the time step where the solver. How to implement a mesh refinement study comsol multiphysics. You will experience speedup by a factor of up to ten in software responsiveness, as well as new and improved features for solving, meshing, and the physicsbased addon modules.
Sep 26, 2011 when you have convergence issues, try to get comsol to plot a useful value during its solving, this helps to see what is going wrong and might give a clue how to handle it you seem to get a convergence issue when the flow has fully stopped in the inlet2 if you keep a very small flow it seems to work better i. The site is made by ola and markus in sweden, with a lot of help from our friends and colleagues in italy, finland, usa, colombia, philippines, france and contributors from all over the world. Press question mark to learn the rest of the keyboard shortcuts. The fully coupled solution approach, with the plot while solving enabled. The number of refinements required for the solution to converge, if convergence is achieved, or the number of solution steps requested for the required refinements. Comsol is the developer of comsol multiphysics software, an interactive environment for modeling and simulating scientific and engineering problems. Comsol software users who are onsubscription should submit their questions via the support center for a more comprehensive response from the technical support team. Mar 19, 2018 the boundary element method bem is included in the acoustics module as a physics interface. How to draw mesh convergence plot in comsol so that i can check at what element size my result converges. What information we are going to get from comsol multiphysics. To sum up,i would like to know which module or modules should i use and if you have any. Browse and download documentation to get started using the comsol software. Here, we will examine techniques for accelerating the convergence of these two methods.
By plotting and evaluating the algebraic residual, you can troubleshoot models that do not converge or converge slowly, so that you can find your simulation results as quickly and efficiently as possible. If you see random spikes, either something randomly changed fast with time or there was a convergence errror. Apr 27, 2016 the convergence plot for the turbulent flow over a backward facing step tutorial model. The second purpose is to explain in detail how to conduct these convergence studies in both using the graphical user interface gui of comsol 4. Newest comsol questions computational science stack. How do i plot convergence in newtons method to find.
Numerical demonstration of finite element convergence for lagrange elements in comsol multiphysics m. Holzbecher 2 1 charles university, prague czech rep. The dimensions of the cantilever beam, fixedfixed beam and three various structured. Aem 535 hw3a convergence analysis of plate with a hole. Four plot windows tiled to show four aspects of the model solution clockwise from the topleft plot. What information we are going to get from comsol multiphysics convergence plots. Alternativeto is a free service that helps you find better alternatives to the products you love and hate. Improving convergence of transient models comsol multiphysics. Nov 26, 2019 the convergence plot of the simulation with a linear and constant bh curve extrapolation. Some of the distinct advantages i have experienced are. In order to view the plot, either provide a line specification to draw point markers or use the sqrtaminus1 value to draw a line from the previous value to the newly calculated value of sqrta. Divergence in comsol computational science stack exchange. Solidworks welcomes your feedback concerning the presentation, accuracy, and thoroughness of the documentation. The curves shown in the convergence monitor are plots of the average value of each degree of freedom throughout the entire.
Hello cfd community, i am experience some convergence problems and thats why want to observe user variables in my simulation. Running a simulation in comsol multiphysics 68 youtube. Solidworks 2016 sp05 to disable web help from within solidworks and use local help instead, click help use solidworks web help. This implies that the solution has reached steadystate. Does anyone know if it is possible to show a convergence plot during a livelink with matlab. Use the form below to send your comments and suggestions about this topic directly to our documentation team.
Section 3 details the steps necessary in the gui to manually obtain the raw results of the convergence. Jan 16, 2015 running a simulation in comsol multiphysics 6 8 comsol. Thats right, all the lists of alternatives are crowdsourced, and thats what makes the data. I am not able to give convergence criteria in comsol multiphysics. After the analysis is finished, display the convergence information by clicking the convergence plot tab on the output bar. When you have convergence issues, try to get comsol to plot a useful value during its solving, this helps to see what is going wrong and might give a clue how to handle it you seem to get a convergence issue when the flow has fully stopped in the inlet2 if you keep a very small flow it seems to work better i. A special case is the convergence plot window, an automatically generated plot window that displays a graphical indication of the convergence of the solution process while a model is running.
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