Nitish,<div><br></div><div>Please share your code as well so we can help with troubleshooting! Without seeing the code, here’s a guess: Sometimes it comes down to cell centers versus cell edges?</div><div><br></div><div>Scott</div><br>On Thursday, September 9, 2021, Acharya, Nitish <<a href="mailto:nachary2@ur.rochester.edu">nachary2@ur.rochester.edu</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




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<span style="font-size:11pt">Dear all,</span></div>
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<span style="font-size:11pt">I am trying to simulate a laserslab problem with an initial sinusoidal perturbation embedded (figure attached). As shown in the figure, I initialize the perturbation wavelength to be 125 um on a target width of 500 um (along x). 
 I don't understand why the perturbation is non-periodic? When I measure the wavelength manually in VisIt, it turns out to be ~ 130 um. </span></div>
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<span style="font-size:11pt">Could someone explain what might have went wrong here? I really appreciate your help.</span></div>
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<span style="font-size:11pt">Thanks,</span></div>
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<span style="font-size:11pt">Nitish</span></div>
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<p style="margin-top:0px;margin-bottom:0px;margin-top:0;margin-bottom:0"><span style="font-size:10pt">Nitish Acharya</span></p>
<p style="margin-top:0px;margin-bottom:0px;margin-top:0;margin-bottom:0"><span style="font-size:10pt">PhD Student</span></p>
<p style="margin-top:0px;margin-bottom:0px;margin-top:0;margin-bottom:0"><span style="font-size:10pt">Department of Mechanical Engineering</span></p>
<p style="margin-top:0px;margin-bottom:0px;margin-top:0;margin-bottom:0"><span style="font-size:10pt">University of Rochester</span></p>
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