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Thanks Ketan.
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<div>Saikat,</div>
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<div>You may also be able to just use the values in vxlag() and thus avoid the need</div>
<div>for extra storage.</div>
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<div>A simple test would verify.. Of course, it's not that expensive to just store your</div>
<div>own copies for purposes of your own analysis.</div>
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<div>Paul</div>
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<div id="divRpF234754" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>From:</b> nek5000-users-bounces@lists.mcs.anl.gov [nek5000-users-bounces@lists.mcs.anl.gov] on behalf of nek5000-users@lists.mcs.anl.gov [nek5000-users@lists.mcs.anl.gov]<br>
<b>Sent:</b> Tuesday, April 25, 2017 1:06 PM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> Re: [Nek5000-users] Time derivative of Scalar field<br>
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<div class="PlainText">Hi Saikat,<br>
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I have attached a usr file that shows how to calculate finite difference based first derivative of the first passive scalar t(1,1,1,1,2) using the current time step and two previous time steps. The coefficients for the derivative are obtained using a call to
fd_weights_full, and I am using a common block for storing the values of the scalar at two previous time-steps.
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Ketan<br>
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