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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Zahid,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">You could try using BDRY. In the LaserSlab Config file, add:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">VARIABLE BDRY<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Then you can use it accordingly in a subroutine such as Simulation_adjustEvolution. Cells with bdry < 0 will be treated as fluid like normal, and cells with bdry > 0 will be treated like “solids”. Material
from solid cells won’t advect and their faces will be treated like reflecting boundaries for neighboring fluid cells.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Set the value like you would any other variable:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">U(BDRY_VAR,I,j,k) = -1.0 ! fluid<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">U(BDRY_VAR,I,j,k) = 1.0 ! solid<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">You can try using +/- 1.0 based on a temperature threshold.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">--</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#181A1B">Eddie Hansen</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#181A1B">Applications Group Leader<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#181A1B">Flash Center for Computational Science</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">flash-users <flash-users-bounces@flash.rochester.edu> on behalf of Shah, Zahid Hussain <shah858@purdue.edu><br>
<b>Date: </b>Friday, December 27, 2024 at 7:52 PM<br>
<b>To: </b>flash-users@flash.rochester.edu <flash-users@flash.rochester.edu><br>
<b>Subject: </b>[FLASH-USERS] Turning advection off for LaserSlab<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hello Flash users,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I am using LaserSlab to simulate laser ablation process.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">How can I turn the advection off for target region with a temperature lower than threshold (any arbitrary value)?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Right now, I am just doing folowing in the file hy_uhd_unsplitUpdate.F90<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> where (U(TELE_VAR,:,:,:) .le. 300.0 .and. U(TARG_SPEC,:,:,:) .ge. U(CHAM_SPEC,:,:,:))<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> U(VELX_VAR,:,:,:) = 0.0<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> U(VELY_VAR,:,:,:) = 0.0<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> U(VELZ_VAR,:,:,:) = 0.0<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> end where<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">But there is still significant advection of target into the chamber. I assume, this is due to some kind of (numerical) diffusion. Is there is any better way to turn off the advection for target region with a temperature
lower than threshold?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Other way could be to adjust EOS, but I want to try turning off the advection first.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Thank you,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Zahid Hussain<o:p></o:p></span></p>
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