AutoRemesh in the COMSOL Multiphysics Programming Reference Manual.
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Mesh quality (the default). The solver remeshes when the mesh quality becomes less than a given limit. Edit the Mesh quality expression as needed, or click the Replace Expression button () to choose another expression. Edit the limit in the Stop when mesh quality is below field (default value: 0.2).
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Distortion. The solver remeshes when the distortion that the mesh has undergone becomes larger than a given limit. Edit the Distortion expression or click the Replace Expression button () and choose another expression for the distortion if desired. Edit the limit in the Stop when distortion exceeds field (default: 2) if desired. The condition for stopping is (for a model component called comp1)
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General. The solver remeshes when a logical condition becomes true. Edit the condition in the Stop when condition is true field or click the Replace Expression button () and choose another expression.
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When Last output from solver before stop is selected, the remeshing is done on the last solution that would have been stored by the solver if remeshing would not have occurred. This setting discards any solver progress done since the last output.
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When Last step taken by solver before stop is selected (the default), the remeshing is done using the solution from the last solver step before the condition for remeshing became fulfilled. Only the very last solver step, at which the condition was triggered, is discarded. Typically this setting is preferred because then the progress of the automatic remeshing does not depend on the solver’s list of output times.
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