stationary solver comsol

Under Initial values of variables solved for, the default value of the Settingslist is Physics controlled. From there, if an additional small load increment is applied, the previously computed solution is a reasonable initial condition. That is: It is also possible to compute the derivative of the solution with respect to the continuation parameter and use that derivative (evaluated at the iteration) to compute a new initial value: where is the stepsize of the continuation parameter. Within either of these features, it can also be helpful to enable the Results While Solving option, as shown in the screenshot below, to visualize the iterations being taken during the solution. Nonlinearity ramping is an especially useful technique if any of the nonlinear terms in the model are very abrupt. Improving Convergence of Nonlinear Stationary Models - Informazioni Here we introduce a more robust approach to solving nonlinear problems. Click the link in the email we sent to to verify your email address and activate your job alert. If so, see: Knowledgebase 1030: Error: "Out of memory". With respect to any nonlinearities, replace them by a reasonable linearized term. The segregated approach, on the other hand, solves sets of unknowns separately. Multiphysics problems are often nonlinear. Using a predictor of type Constant will take the solution from the iteration and use it as the initial value for the iteration. The problem is that when I run my model this message appear: Undefined value found. If both load ramping and nonlinearity ramping are still leading to slow convergence, refine the mesh. (Frequency Domain should be the last step). This consent may be withdrawn. Asking for help, clarification, or responding to other answers. Knowledgebase 1260: What to do when a linear stationary model is not solving, Knowledge Base 1240: Manually Setting the Scaling of Variables, What to do when a linear stationary model is not solving, Knowledge Base 1254: Controlling the Time Dependent solver timesteps, Galleria dei Modelli e delle App di Simulazione, 2023 da COMSOL. Review the model setup to resolve these. However, it is usually not possible to know this ahead of time. Consult your product manuals for complete trademark details. Please dont hesitate to post comments below or send emails to us if you experience any other problems. (I am begginer in comsol) Thank you. The segregated approach, on the other hand, solves sets of unknowns separately.

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