FAQ: Tips on Convergence/skew
I have problems with Convergence and I think it is because of
There are a number of reasons why a mesh may not converge.
Skew is often blamed for poor convergence, but in the
case of Harpoon meshes, this is rarely the case. In
fact, it depends on the cell type, shape and location.
A mesh may solve with one set of boundary conditions,
but fail with another.
We have spent a lot of time developing some optimisation
routines which will help with covergence
are some things to check before blaming skew
1. Use the "Standard" optimisation setting
in the meshing preferences. If this does not work, change
2. If you do not require multiple volumes, delete
all the ones not needed. Never set the max volume to
1 in the preferences. This will hide multiple volumes
which will often give problems with convergence
3. Make sure that cells are not where they should
not be. A group of cells connected to the main volume
by a single (or few) faces can cause convergence problems.
Use the "Find Baffles" button to in the fix cells area
and/or the mesh trace (if needed) to find out where
any holes may be.
4. Look for areas of one cell thick, say, between
walls. You must allow Harpoon to resolve these areas
by using more cells or do not mesh them at all. This
can be done by editing your geometry or by using a larger
local cell size.
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