Troubleshooting for 3D trusses, if anyone's out there. : r/COMSOL - reddit Then use this file to provide the initial conditions in time dependent model. As part of our solver blog series we have discussed solving nonlinear static finite element problems, load ramping for improving convergence of nonlinear problems, and nonlinearity ramping for improving convergence of nonlinear problems. Second, the continuation method will automatically take smaller load increments if a solution cannot be found. I personally liked emailing them the file, ", "This flower shop is the best! Segregated approach and Direct vs. Iterative linear solvers, Time dependent function and stationary study, Combining Adaptive Mesh Refinement with Data Filtering, What to do when a linear stationary model is not solving, Galleria dei Modelli e delle App di Simulazione, 2023 da COMSOL. It can be useful while solving sequences of linear systems arising from, for example, nonlinear problems. The stationary solver is used both for Stationary (time-invariant) and Frequency Domain (time-harmonic) study types. If you define this nonlinearity ramping such that the first case (P=0) is a purely linear problem, then you are guaranteed to get a solution for this first step in the ramping. The other low-level default settings within the Stationary Solver are chosen for robustness. Each physics is thus solved as a standalone problem, using the solution from any previously computed steps as initial values and linearization points. Right-click on the Stationary Solver node and add either the Segregated or Fully Coupled feature. Your Discussion has gone 30 days without a reply. Understanding stationary and time dependent solver COMSOL Multiphysics Each physics is thus solved as a standalone problem, using the solution from any previously computed steps as initial values and linearization points. Starting from zero initial conditions, the nonlinear solver will most likely converge if a sufficiently small load is applied. Use this parameter to modify the nonlinearity expressions in the model. In such cases it will be particularly helpful to ramp the load gradually in time, from consistent initial values. About the Stationary Solver - COMSOL Multiphysics The coupling terms between the different groups are thus neglected. COMSOL does not assume any legal liability for the accuracy of the data disclosed. At low flow speeds the flow solution will be time invariant, but at higher flow rates there will be vortex shedding, a time-varying change in the flow field behind the cylinder. Assuming a well-posed problem, the solver may converge slowly (or not at all) if the initial values are poor, if the nonlinear solver is not able to approach the solution via repeated iterations, or if the mesh is not fine enough to resolve the spatial variations in the solution. listed if standards is not an option). The Iterative Solvers - COMSOL Multiphysics

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