<div dir="ltr">Hi Jonathan,<div><br></div><div>Since you want to know your position in the y-axis, I would think that yes Grid_bcApplyToRegionSpecialized would be the way to go since you'll have access to the blockId so you can call Grid_getCellCoords. This is also in the docstring for GbATRS:</div><div><br></div><div>





<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Menlo;color:rgb(50,244,241)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">...several extra arguments over Grid_bcApplyToRegion. One is the </span><span class="gmail-s2" style="font-variant-ligatures:no-common-ligatures;color:rgb(0,0,0);background-color:rgb(224,228,9)">block</span><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">Handle, which allows</span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Menlo;color:rgb(50,244,241)"><span class="gmail-s1" style="font-variant-ligatures:no-common-ligatures">!! <span class="gmail-Apple-converted-space">  </span>access to the coordinates information.</span></p></div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><br></div><div>Best,</div><div dir="ltr">--------<div>Ryan</div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 25, 2023 at 3:36 PM JONATHAN PROCTOR <<a href="mailto:J.Proctor-2016@hull.ac.uk">J.Proctor-2016@hull.ac.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-2642839083941093004">




<div dir="ltr">
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<span style="font-size:15px;color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline">Hi
 All,</span><br>
</div>
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<span style="font-size:15px;color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline"><br>
</span></div>
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<span style="font-size:15px;color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline">I'm
 a new user to FLASH. I've been attempting to implement a crossflow into my simulations with a velocity that is dependent upon the position in the y axis. So far, I've attempted to edit the Grid_bcApplyToRegion file by overwriting the DIODE boundary condition
 with little success. Should I instead attempt this in a <span style="color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline">Grid_bcApplyToRegionSpecialized file? And would I have to define the coordinates
 system as done in the simulation_initBlock file?</span></span></div>
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<span style="font-size:15px;color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline"><br>
</span></div>
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<span style="font-size:15px;color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline">Thank
 you in advance!    </span></div>
<div>
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<br>
</div>
<div id="m_-2642839083941093004Signature">
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<span style="font-size:12pt;margin:0px">Jonathan</span></p>
</div>
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