comsol convergence plot

Convergence Plot. How to overcome the convergence problem in comsol nonlinear static analysis? To understand where low-quality elements are positioned and which mesh size parameters to change, it can be a good idea to perform a plot of the mesh. This is a great way of ensuring license optimisation for these expensive COMSOL licenses. Plot of the derivative of the residual for different values of Q. Automatic Convergence Assessment assesses convergence, and stops the analysis when the solution is no longer changing. By default convergence plots … 2018 à 03:10 UTC−7 Mesh, Studies & Solvers, Structural Mechanics & Thermal Stresses Version 5.0 0 Replies Let’s check the Outlets convergence plot of a successful simulation. 2 Elliptic Test … From what I understand the positions at which the point sinks are defined will act as point of singularity since the solution will tend toward infinity, please correct me if I am wrong. Posted 9 sept. 2018 à 14:12 UTC−7 RF & Microwave Engineering, Results & Visualization, Studies & Solvers 0 Replies If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. Posted 24.04.2016, 22:26 GMT-7 Studies & Solvers Version 5.2 0 Replies . Let’s also plot out the corresponding derivative of the residual (the Jacobian) for the same range of T and values of Q below. Tutorials and Training Materials. Lorenzo Casero . For example, you can plot residual(spf.U) to get a plot of the latest residual of the velocity U in a fluid-flow simulation. Posted 24-Aug-2015, 1:09 am GMT-7 Studies & Solvers Version 4.3 1 Reply . I am new to comsol multiphysics software. Send Private Message Flag post as spam. Patrick Ma . If you would like a live view of which users are consuming which licenses, with a dashboard to analyse past usage, including those potentially hoarding/abusing licenses - contact me now for a demo or free trial of LAMUM ( www.teameda.com ) When I look at the Convergence Plot 2, which is "Reciprocal of step size" vs "Time step", I can see the reciprocal of step size is between 10^5 and 10^6. Send Private Message Flag post as spam. For a list of such trademark exporting convergence plot data. Discussion Closed This discussion was created more than 6 months ago and has been closed. Ideally, the error should go down monotonically if it does converge, then start investigating ramping the loads, the nonlinearities, or the multiphysics couplings. The plot below shows the trajectories of the rays as they reflect off the Vdara® hotel, with the arrows indicating the direction of the incident solar radiation. The convergence plot of the segregated solver, and the probe plot, are shown below. questions about convergence plot. in COMSOL; this is the contents of Section 2. Convergence study using COMSOL Convergence study is done by changing the mesh configuration from extra coarse to extra fine. Restoring the COMSOL Desktop® to a Built-In Layout Troubleshoot convergence issues by plotting and evaluating your model's algebraic residual via the residual operator in COMSOL Multiphysics. Please login with a confirmed email address before reporting spam Hello, I … questions about convergence plot. Support Notes. High fluctuations are observed in pressure and velocity values. The positive net charge screens the negatively charged wall. in COMSOL; this is the contents of Section 2. For improved efficiency when saving solutions on a cluster, you can now right-click a Solution node and choose Store Solution Using Distributed Storage. CAD Tool Quick Start Guides. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. The integration points are often called Gauss points, even though this nomenclature, strictly speaking, is correct only for integration points defined by the Gaussian quadrature method. By default, the convergence criterion is 0.001. Note: This discussion is about an older version of the COMSOL Multiphysics ... To start a new discussion with a link back to this one, click here. We do this either by clicking the Plot button in the Mesh ribbon or by right-clicking the Mesh head node of the mesh we would like to plot and selecting Plot. studied cases the convergence rate of COMSOL numerics is identical to the theoretically derived convergence rates. Outlets convergence plot shows some serious issues. I will be using comsol software for research work. COMSOL Multiphysics v4.2 Release Highlights. About the COMSOL Product Suite. It has been like this for several hours, and the progress value is at 2% without increasing. Wu Jakes . COMSOL Multiphysics v4.2 New Features Video. Using 2 variables from 2 different solutions to make a single plot. Sai Ram Katikala @Sai-Ram-Katikala. exporting convergence plot data. June 15, 2011. 03 October 2020 3 4K Report. The more clues you have the better your guesses and so on. Learn about all of the updates relating to studies and solvers below. Frederic Kanoufi . The Segregated solver settings with the plot of the residual, specified under Results While Solving. This example is a nice illustration of what happens when you solve transport problems with some sort of stationary approach — in this case, pseudo time stepping. Each guess gives you clues. Roland Schwarz | 03/06/16. Support. The second purpose is to explain in detail how to conduct these convergence studies in both using the graphical user interface (GUI) of COMSOL 4.0a as well as using COMSOL’s LiveLink for MATLAB. Convergence plots use graphics to show how an error estimate or time step evolves during the solution process for nonlinear, time dependent, and parametric solvers. Hi All, This is a follow up to my previous post here. Frederic Kanoufi . Automatic Convergence Assessment assesses convergence, and stops the analysis when the solution is no longer changing. Obtained number of domain and boundary elements for each configuration is as follows: Mesh configuration No. However, since we are limited by finite comp… I have tried to define point sinks in the geometry. Please login with a confirmed email address before reporting spam Hi guys, 1. Plot depicting the net space charge, i.e. of domain elements No. The second purpose is to explain in detail how to conduct these convergence studies in both using the graphical user interface (GUI) of COMSOL 4.0a as well as using COMSOL’s LiveLink for MATLAB. They include: † Messages: Various information about events of the current COMSOL comsol-license-agreement) и могут использоваться и копироваться исключительно в соответствии с его условиями. To start a new discussion with a link back to this one, click here. Application Notes. COMSOL primarily uses the finite element method(FEM) to compute single- and multiphysics simulations. In order to understand the relationship between nozzle structure and spray field, the present paper conducts velocity-based parametric study … Posted 13 dic 2013, 07:28 GMT-8 Interfacing, LiveLink for MATLAB, Results & Visualization, Studies & Solvers Version 4.3, Version 4.3a, Version 4.3b, Version 4.4 3 Replies Four Plot windows tiled to show four aspects of the model solution (clockwise from the top-left plot: isothermal contours, stress distribution, closeup of the stress at the solder joint, and a convergence plot for the nonlinear solver). This work follows previous pa-pers, all on the stationary elliptic analogue to (1.1), starting with [1, 2] for smooth and non-smooth sources, respectively, and [7, 8] providing a tuto-rial description of the process for COMSOL 4. Please find attached a convergence plot of a nonlinear model computation (created automatically in COMSOL). One image uses log-axis for the relative error, while the other uses a linear axis scale. Here the convergence criterion is set to 1e-6 (=0.0001% relative error / tolerance) and it took 16 iterations to reach convergence. Note: This discussion is about an older version of the COMSOL Multiphysics ... To start a new discussion with a link back to this one, click here. Understanding the Convergence Plot, and 'Undefined Value in Equation Residual Vector' Posted 16 oct. 2014 à 04:22 UTC−7 2 Replies . This is a clear indicator that boundary conditions or the mesh quality might be responsible for numerical issues at the outlets. Plot of the residual for different values of the parameter Q. The convergence plot for the Turbulent Flow Over a Backward Facing Step tutorial model. Send Private Message Flag post as spam. COMSOL BV Röntgenlaan 37 ... † Convergence plots for monitoring convergence of nonlinear, iterative, and time-dependent solvers. It has to do with the deviations that occur from successive calculations of a value. The less change that occurs with each iteration, the closer it gets to an exact solution. The direction of solar radiation is set up to replicate the conditions at the hotel’s pool in the month of September at the time of 11:30 a.m. Posted 28-Aug-2014, 1:17 pm GMT-7 0 Replies . The COMSOL Multiphysics® software offers several different formulations for solving turbulent flow problems: the L-VEL, algebraic yPlus, Spalart-Allmaras, k-ε, k-ω, low Reynolds number k-ε, SST, and v2-f turbulence models. Send Private Message Flag post as spam. Kind regards, Prasad Bhonsule. I need results for this simulation by the beginning of next week. Information Windows These are the windows for non-graphical information. Posted 28-Aug-2014, 1:17 pm GMT-7 0 Replies . Keywords: Finite Elements, convergence order, adaptive meshes, Poisson equation, potential equation 1. 4. A COMSOL Multiphysics® simulation typically includes one or more field quantities in its output. Convergence plots. After the analysis is finished, display the convergence information by clicking the Convergence Plot tab on the Output Bar. by Phil Kinnane. It may be worth your time to learn and understand what convergence means. of boundary elements Extra coarse 379 180 Coarser 534 195 Coarse 667 206 The convergence plot for the Turbulent Flow Over a Backward Facing Step tutorial model. Notice the fast convergence toward the end. 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.

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