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<div class="moz-cite-prefix">Hi Praveen <br>
<br>
We have implemented arpack to calculate spectra of the linearised
direct and adjoint Navier-Stokes equations for relatively complex
flow configurations. Some results you can find at
<a class="moz-txt-link-freetext" href="http://www.sciencedirect.com/science/article/pii/S0997754614001009">http://www.sciencedirect.com/science/article/pii/S0997754614001009</a>
(Global stability and optimal perturbation for a jet in
cross-flow). We are going to talk about ot the aspects on the nek
user meeting in Greece? Are you going to participate?<br>
Regards<br>
Adam<br>
<br>
<br>
On 08/08/14 08:40, <a class="moz-txt-link-abbreviated" href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a> wrote:<br>
</div>
<blockquote
cite="mid:mailman.3119.1407480058.3424.nek5000-users@lists.mcs.anl.gov"
type="cite">
<div dir="ltr">Dear neks
<div><br>
</div>
<div>I want to compute the rhs of the linearized Navier-Stokes
equation which would be of the form</div>
<div><br>
</div>
<div>M du/dt = A(us) u + Bp</div>
<div>0 = B^T u</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Thanks</div>
<div>praveen</div>
</div>
<br>
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