Sang pham van <pvsang...@gmail.com> writes: > Hi Dave, > I guess you are the one contributed the ex42 in KSP's examples. I want to > modify the example to solve for stokes flow driven by volume force in 3D > duct. Please help me to understand the code by answering the following > questions: > > 1. Firstly, just for confirmation, the equations you're solving are: > \nu * \nabla \cdot \nabla U - \nabla P = 0 and
For variable viscosity, it must be formulated as in the example: \nabla\cdot (\nu D U) - \nabla P = 0 where D U = (\nabla U + (\nabla U)^T)/2 > \nabla \cdot U = 0 > > where U = (Ux,Uy,Uz), \nu is variable viscosity? > > 2. Are U and P defined at all nodes? (I googled the Q1Q1 element, it looks > like a box element with U and P defined at 8 corners). Yes. > 3. Are nodes' coordinate defined though the DA coordinates? Yes, though they are set to be uniform. > 4. How can I enforce noslip BC, and where should I plug in volume force? Enforce the Dirichlet condition for the entire node.
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