I am using the Particle Tracing and Magnetic Force modules in COMSOL. My simulation is taking too much time and gets stuck at 4% progress. The time settings are (start, step, stop) = (0, 0.1, 1) [s]. How can I resolve this issue?
When a COMSOL simulation is taking a long time or getting stuck at a low percentage, especially when using modules like Particle Tracing and Magnetic Forces, there are several potential causes and solutions to consider :
Use a coarser mesh or adaptive mesh refinement to reduce the number of elements. Ensure the mesh is sufficiently refined only in regions where high accuracy is needed.
Increase the time step size or use adaptive time stepping. For particle tracing, ensure the time step is small enough to capture particle motion but not unnecessarily small.
COMSOL simulations can take a long time even for very short simulation times due to mesh density, solver type, and numerical stiffness. If the model has fine mesh elements, the solver must process a large number of equations, increasing computational time. Implicit solvers, commonly used for stability, require solving large matrix systems at each step, making them slow. Highly nonlinear physics, such as turbulence, multiphase flow, or heat transfer with phase change, also introduce stiffness, forcing the solver to take extremely small time steps. Refining the mesh, optimizing solver settings, or using adaptive time stepping can help speed up the simulation.
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