[Nek5000-users] Computing RHS for linearized NS

[nek5000-users at lists.mcs.anl.gov]

Dear neks

I want to compute the rhs of the linearized Navier-Stokes equation which
would be of the form

M du/dt = A(us) u + Bp
0 = B^T u

where us is the stationary solution about which the equations are
linearized.  I want to use ARPACK to compute eigenvalues for which I need
to be able to compute the above matrix-vector products. Is this already
available in some part of nek. I have tried to read perturb.f but have not
succeeded in clearly understanding the code.

Thanks
praveen
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