Solver Behavior Issue Convergence Plot Advice 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. Starting from zero initial conditions, the nonlinear solver will most likely converge if a sufficiently small load is applied. that is, start by first solving a model with a small, but non zero, load.
Solver Behavior Issue Convergence Plot Advice Because cfd simulations are varied, a comprehensive list is not possible, but the following short list of common problems and solutions should be helpful. if you still cannot resolve your problem, contact your ansys cfx technical support representative for advice. The solver log and residual plots provide detailed information about the solution process and can reveal the nature of convergence difficulties. examining these outputs should be a standard part of troubleshooting. Following these guidelines should resolve most convergence issues for this class of models. the bdf method is generally the default for fem models involving diffusion, convection, and reactions and such cases represent the majority of cases that benefit from tuning of solver settings. Analyze convergence plot and violation trends. explore the convergence plot and violation views in analyzing the feasibility of a grading project. interact with the solver calculations by reducing or removing objectives. learn basic strategies to relax constraints.
Solver Behavior Issue Convergence Plot Advice Following these guidelines should resolve most convergence issues for this class of models. the bdf method is generally the default for fem models involving diffusion, convection, and reactions and such cases represent the majority of cases that benefit from tuning of solver settings. Analyze convergence plot and violation trends. explore the convergence plot and violation views in analyzing the feasibility of a grading project. interact with the solver calculations by reducing or removing objectives. learn basic strategies to relax constraints. Everything looked perfect — convergence achieved, stresses within limits, clean contour plots. but something felt off. the first natural frequency didn’t align with the expected behavior. Do not put every detail into your first model. possibly start with contact, but no plasticity, friction, or nonlinear geometry to gain an understanding of how the model behaves. add one piece at a time to limit the number of sources of convergence issues. If when you come across a physics coupling that is blowing up your convergence, try a simplifying test case where you take only the problematic one and verify that the boundary conditions and chosen solver work in isolation. Comsol multiphysics. learn how convergence plots visualize error estimates and time steps in nonlinear and parametric solvers. control settings and interpret results effectively.
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