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When no Mesh Stiffness parameter is set or a constant stiffness is set, then a linear deformation of the mesh is expected. However, when the element sizes vary to a great extend, then it may happen that elements are deformed less then expected. A result can be a self-overlapping mesh with negative volumes.
In this case the single precision solver might not be accurate enough. Use the double precision solver and set the convergence criteria for the Mesh Displacement equation to 1E-05 and set the coefficient loops to 10 or higher in CFX-Pre > Equation Class Settings > Set coefficient loops.
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