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Old   January 30, 2008, 12:01
Default Mass matrix
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Mehmood ur Rehman
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I am solving Navier-Stoke problem. If i using tetrahedron, i get negative diagonal elements in the mass matrix. any idea to overcome this problem.
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Old   January 30, 2008, 13:56
Default Re: Mass matrix
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CFD newbie
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Yes use Hexa. Hope it helps!

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Old   January 30, 2008, 16:47
Default Re: Mass matrix
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Mehmood ur Rehman
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I have already used hexahedrons and i have no problem. i need help in tetrahedron. Can give me pointer to literature, where these kind of problems are solved. cheers
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Old   January 30, 2008, 19:16
Default Re: Mass matrix
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Sorry Rehman i would have helped if i knew the answer. You did not elaborate your problem properly either. Help Guyssssssss!
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Old   January 31, 2008, 04:31
Default Re: Mass matrix
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Mehmood ur Rehman
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Actually i use diagonal of the velocity mass matrix in LSC preconditioner. In tetrahedron, i get negative values on the diagonal that reduces the convergence rate. i have no problem in hexahedron. my be this is enough to elaborate my problem
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