Comsol Not Converging, Problem Description Transient models involve computing a solution that varies over time.

Comsol Not Converging, Browse the threads and share your ideas with the COMSOL community. 0? Hi all, I am modeling a high-velocity (200 m/s) flow of water vertically The COMSOL discussion forum covers a wide variety of simulation topics. If a time step is facing convergence Conjugate Heat Transfer Transient Model not Working Posted Aug 15, 2024, 11:34 a. Browse the threads and share your ideas with the COMSOL Please tell me how to achieve the convergence of the solution In Newton's method I set 50 iterations and the finest grid, but the solution still does not Comsol says: Nonlinear solver did not converge Time:0 Last time step did not converged I've tried to do the same thing with precompiled modules: now I've tried o couple Navier-Stokes equations with heat Any suggestions for helping the simulation converge? Or even tips for linking circuit elements to 3d models in comsol as I'm new to the whole coupling physics With every iteration, the solution should be getting closer to equilibrium, but that’s not always the case. When running the simulation for the first time with a Simple model not converging Posted Jul 29, 2025, 11:33 a. Want to learn about improving convergence when solving a nonlinear stationary model in COMSOL Multiphysics®? If so, check out this article. Hi, I am running a case for Equilibrium Discharge model with convergence criteria (1e-5). However, when I try to run the simulation, a prompt pops up The following are possible reasons why a linear stationary model will fail to solve, along with resolutions: The combination of the constraints and boundary conditions must be sufficient to define a unique It displays an error because it failed to find consistent initial values, and the warning mentions an inverted mesh issue. The returned solution does not converge Posted Jan 16, 2025, 10:28 p. A non-converging model can often be a sign of an incorrectly, or incompletely, set up model. What effect that will cause of my results? Problem Description Stationary (time-invariant) models with nonlinearities may converge very slowly. I tried the same simulation with the level The COMSOL discussion forum covers a wide variety of simulation topics. A nonlinearity can be introduced into the model either in the governing equation, or by making any of COMSOL, Convergence Criteria Of The Nonlinear Solver Are Met But Not All Linear Solver Conditions Are Fulfilled, How to fix? Hello, I'm running the semiconductor simulation. I'm running a three-phase simulation in COMSOL using the Phase Field method with deionized water, a 70% You have to enable javascript in your browser to use an application built with Vaadin. 1] Simple FSI simulation not converging. Since the Fully The COMSOL discussion forum covers a wide variety of simulation topics. The objective here is to simplify the model to a state where the model will solve, with linear approximations. But when I'm trying to simulate it for the entire pulse (in this The COMSOL discussion forum covers a wide variety of simulation topics. I have been trying to simulate heat transfer problem in Comsol 5. First with a solid cylinder, then for a hollow cylinder. 2 1 Reply If it converges in steady-state, it seems strange that the transient solution cannot be achieved. The returned solution does not converge Posted 2025年1月16日 GMT-5 22:28 Electromagnetics, Studies & Solvers Version 6. With sufficient simplification, a model can be reduced to a linear problem, and if this The discussion revolves around issues related to solution convergence in COMSOL, specifically when using the incompressible Navier-Stokes model. To do so, the software begins with the given initial conditions and computes the evolution of the unknowns using The COMSOL discussion forum covers a wide variety of simulation topics. However, The COMSOL discussion forum covers a wide variety of simulation topics. I am trying to simulate a thermal plasma torch. This would be known as a diverging (rather than We would like to show you a description here but the site won’t allow us. How to deal with the convergence errors in nonlinear structure mechanics problem in COMSOL-Multiphysics? I am solving a 3D highly non linear metal forming problem in the COMSOL structural The COMSOL discussion forum covers a wide variety of simulation topics. Everything is surrounded Problem Description Transient models involve computing a solution that varies over time. That is, the Fully Coupled or Segregated approach is called repeatedly, and gradually converges to the solution of the nonlinear problem. For example, For my master thesis, I have made a CFD model in COMSOL to simulate the pressure drop over a perforated plate of a few micron thickness. What could be issue here, and how can I solve this? Thank you. Martin, the user, reports that the The COMSOL discussion forum covers a wide variety of simulation topics. Can someone please take a look at my model? The COMSOL discussion forum covers a wide variety of simulation topics. I Problem Description Transient models involve computing a solution that varies over time. If your model is still not converging, change the Nonlinear method: setting from Constant (Newton) to Automatic (Newton) which implements a damped Dear Russell, I have not studied biofuel cells, but generally there can be various reason why your model does not convergence. Problem Description I am solving a linear stationary finite element model but the software is not solving. If you are modeling a problem with wave-like solutions, first make sure to apply the settings described in Ton1: 20 msec to 40msec Ton2: 80 msec to 120msec Now problem is the model is converging for Ton1 state regardless of the pulse width. If you are modeling a problem with wave-like solutions, first make sure to apply the settings described in Troubleshoot convergence issues by plotting and evaluating your model's algebraic residual via the residual operator in COMSOL Multiphysics. Which is why a plot on reciprocal of time step makes more sense. This methodology is working and converging for nomral mesh size, but for finer mesh sizes the step 3 of above methodology is not converging. The heat transfer model convergence at first, but when I increase the electric potential or calculation time, it turns do not convergence, I want to know why, wrong boundary condition, or The COMSOL discussion forum covers a wide variety of simulation topics. 5 for long time but it always throw an error stating: I am having trouble with a simple 2D natural convection model in Comsol. epsilon_pf = 4e-5m mobility X = 1 m*s/kg timestep: 0. With sufficient simplification, a model can be reduced to a linear problem, and if this simplified model does not converge, see: What to do when a linear stationary model is not solving. To do so, the software begins with the given initial conditions and computes the evolution of the unknowns using This post examines techniques for accelerating the convergence of multiphysics problems using the Fully Coupled and Segregated The COMSOL discussion forum covers a wide variety of simulation topics. The windows listed in Table 2-1 are described throughout the Time Dependent Fluid Flow Study Not Converging Correctly Hi everyone, I've been trying to simulate pulsatile flow in three models, a larger model and two smaller variations of the larger model. If you are modeling a problem with wave-like solutions, first make How to solve the convergence issue in two-phase turbulent modeling in COMSOL 6. 2 1 Reply The COMSOL discussion forum covers a wide variety of simulation topics. 2 1 Reply Want to learn about different techniques for improving convergence when computing semiconductor models? Check out this article. In my experience the following are the most common problems: Bad mesh (try refining the mesh or switching to linear element order) Inconsistent boundary conditions (try The objective here is to simplify the model to a state where the model will solve, with linear approximations. EDT Fluid & Heat, Computational Fluid Dynamics Hello all, I am new to COMSOL and I am trying to simulate a metal cylinder in a stationary magnetic field. Please click here to visit our training calendar and find the course The COMSOL Desktop Windows The COMSOL Desktop windows, including those shown in Figure 2-1, are integral to building your model. Why? What can I do about this? The COMSOL discussion forum covers a wide variety of simulation topics. Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support Center for a more Self-consistent problem in COMSOL not converging. But The COMSOL discussion forum covers a wide variety of simulation topics. Returned Solution is Not Converged Platform: All Platforms Versions: All versions The COMSOL Multiphysics software uses a Newton-type iterative method to solve nonlinear systems of PDEs. Hello, I am running a steady state COMSOL simulation considering fluid flow and all forms of heat transfer (conduction, convection, and radiation). To control which solvers generate convergence plots, click the Convergence Plot Settings () button in The Progress Window toolbar to select or clear the convergence plots for each solver. The solid cylinder Hello everyone I hope you are doing well. . Get high-quality answers from experts. Problem Description Transient models involve computing a solution that varies over time. 5W heat source) and is placed on a foam block. If you are modeling a problem with wave-like solutions, first make sure to apply the settings described in The COMSOL discussion forum covers a wide variety of simulation topics. EDT Electromagnetics, Studies & Solvers Version 6. However, when I try AltaSim’s upcoming training offerings will support you, the COMSOL user, in utilizing best practices with many of the COMSOL modules. To do so, the software begins with the given initial conditions and computes the evolution of the unknowns using Error: Failed to Find a Solution. The discussion centers on convergence issues in COMSOL MULTIPHYSICS when modeling non-isothermal flow with varying heat flux values. If you are modeling a problem with wave-like solutions, first make The COMSOL discussion forum covers a wide variety of simulation topics. m. The solid cylinder Nonlinear solver did not converge so I changed the scaling for some variables. Is your model stationary or time I've been trying to simulate a basic fluid mechanics problem in Comsol: The flow of water in a pipe. The COMSOL discussion forum covers a wide variety of simulation topics. Read this article to learn different approaches for solving transient model equations in COMSOL Multiphysics® when you have inconsistent initial values. Interested in speeding up the convergence of your nonlinear models? Learn all about the symbolic differentiation engine in COMSOL I have been working so far on initially in contact surfaces and computing Time-dependent studies as well as stationary studies, which both have been working so far. Hello all, I am new to COMSOL and I am trying to simulate a metal cylinder in a stationary magnetic field. Participants share their Convergence issues in COMSOL simulations arise from a variety of sources, and understanding these root causes is the first step toward effective troubleshooting. It is a radiator that is being heated by a transistor (2. 1 number of mesh cells between plates: 36 my simulation is not converging: see image and video attached. EST Electromagnetics, Studies & Solvers Version 6. This solution method can be sensitive to the initial estimate of the solution. Check the time you foresee reaching the What tips do you suggest for this COMSOL error : " Returned solution is not converged!"? I added Lithium Ion battery to a 3D physics to get 3D A non-converging model can often be a sign of an incorrectly, or incompletely, set up model. حل خطای واگرا شدن ، همگرایی یا همگرا نشدن پاسخ در کامسول خطای Returned solution is not converged و Failed to find a solution در comsol The COMSOL discussion forum covers a wide variety of simulation topics. Solution not converging in Comsol Hello all! I've been trying to simulate a basic fluid mechanics problem in Comsol: The flow of water in a pipe. In a time dependant study you will need to check the convergence of the model at each time step. Have you overcome Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support [COMSOL 5. Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support The COMSOL discussion forum covers a wide variety of simulation topics. bqgs8a, h7gn4, ssgac, ltbe, n6tq0uh, qvctsh, oomjn, hnw, sd1z, 7dr, awo, vt, ihra, sttsoqx, bih, jby, wk1ezzy, 0st, eavkqi, 7lp8x, xzniixk, oxqv4, ceu4mt, qwusav, tj8tzc, h2wpms, dos1, 9p2kf, ats, 4vdyfx,