Eigenvalues in posdat.f -- CFD Online Discussion Forums

July 10, 2012, 06:36	Eigenvalues in posdat.f	#1
ok_computer New Member Join Date: Jul 2012 Posts: 5 Rep Power: 13	Hello, anybody want to share coding on how to calculate the eigenvalues in posdat.f from a 3x3 matrix. Namely I want to plot the Lambda 2 values and for that I have the definition as S_ij2 + O_ij2 ,where S_ij=0.5(dui/dxj+duj/dxi) and O_ij=0.5(dui/dxj - duj/dxi). Lambda 2 is the second eigenvalue of the matrix but it is somewhat difficult to calculate.

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