<div dir="ltr"><span style="font-size:12.8px">Hello Neks and Paul,</span><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">I wanted to find out the time derivative of Scalar field in my Rayleigh Benard calculations. <br><br>I am attaching my test case in which I have used common block in the .usr file usrchk subroutine to compute the derivative at each time step. I believe vxlag() stores the previous time step values. But this leads to error in my output. <br><br>I would also like to know how to print out the values of dcdt, along with my scalars when I am writing out my .fld files.<br><br>Thanks a lot,</div><div style="font-size:12.8px">Saikat<br><br></div><div><div class="m_8014256993269423043gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span style="background-color:rgb(255,255,255)"><font color="#444444" face="georgia, serif" size="2">Saikat Mukherjee,</font></span></div><div dir="ltr"><font color="#444444" face="georgia, serif" size="2">PhD Student,</font></div><div dir="ltr"><font color="#444444" face="georgia, serif" size="2">Paul Research Group - <a href="http://www.me.vt.edu/mpaul/" target="_blank">http://www.me.vt.edu/mpaul/</a><br></font><div><span style="background-color:rgb(255,255,255)"><font color="#444444" face="georgia, serif" size="2">Engineering Science and Mechanics,</font></span></div><div><span style="background-color:rgb(255,255,255)"><font color="#444444" face="georgia, serif" size="2">Virginia Tech.</font></span></div></div></div></div></div></div></div></div></div></div>
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