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I didn't know that the PostProcessing quantity</div>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", sans-serif; font-size: 15px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;"> {
Name ValueDNSurfaces; Value { Local { [ {d N} ]; In Superficies; Jacobian Sur; Integration Int;} } }</span><br>
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returns the tangential part of the gradient. As you said, that made me think that the Neumann B.C. was not correct. After looking closely to the gradient on the volume, I realized that it was good.</span></div>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", sans-serif; font-size: 15px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;">Thank
you very much.</span></div>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", sans-serif; font-size: 15px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;">Isabel.</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>De:</b> François Henrotte <francois.henrotte@uclouvain.be><br>
<b>Enviado:</b> viernes, 11 de octubre de 2019 10:04<br>
<b>Para:</b> Isabel Martínez <isabelXXI21@hotmail.com><br>
<b>Cc:</b> getdp@onelab.info <getdp@onelab.info><br>
<b>Asunto:</b> Re: [Getdp] Laplace problem, Dirichlet and Neumann condition.</font>
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<div>Hello Isabel,</div>
<div><br>
</div>
<div>it seems to me that the model is correct</div>
<div>and that the Neumann B.C. is correctly taken into account.</div>
<div><br>
</div>
<div>The formulation, however is a bit unusual.</div>
<div><br>
</div>
<div>As you did not say what application it is, </div>
<div>I shall assume it be a thermal problem. </div>
<div><br>
</div>
<div>The Dirichlet B.C. on the side of the cylinder </div>
<div>imposes a normal/radial heat flux. </div>
<div>The Neumann B.C. on the planar faces, </div>
<div>on the other hand, </div>
<div>imposes an axial heat flux (in X direction).</div>
<div>The two B.C’s are thus kind of contradictory </div>
<div>on the edges of the cylindre,</div>
<div>hence the strange looking of the computed gradient of temperature (ValueDNVolume).</div>
<div><br>
</div>
<div>Note also that the PostProcessing quantity</div>
<div><br>
</div>
<div> { Name ValueDNSurfaces; Value { Local { [ {d N} ]; In Superficies; Jacobian Sur; Integration Int;} } }</div>
<div><br>
</div>
<div>only returns the tangential part of the gradient</div>
<div>(the one that lives in the surface).</div>
<div>This might be the reason why you felt</div>
<div>the Neumann B.C. was not taken into consideration. </div>
<div><br>
</div>
<div>Hope this helps,</div>
<div><br>
</div>
<div>Fr. </div>
<div><br>
</div>
<br>
<div>
<div>Le 10 oct. 2019 à 13:59, Isabel Martínez <<a href="mailto:isabelXXI21@hotmail.com">isabelXXI21@hotmail.com</a>> a écrit :</div>
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<span>Dear all:<br>
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<div>This is the first time I am using getdp. I am trying to solve a Laplace problem with mixed boundary conditions in a cylinder. The equations are:<br>
</div>
<div><br>
</div>
<div>- Laplacian N = 0 inside the cylinder.<br>
</div>
<div><br>
</div>
<div>N = 0 on the side of the cylinder.<br>
</div>
<div>grad N * normal[] = - CompX[Normal[]] on the bases of the cylinder.<br>
</div>
<div><br>
</div>
<div>I have my .geo and .pro files, but when getdp computes the solution the Neumann condition is not fulfilled. I checked the normal vectors with the gui of gmsh and the postprocesing of getdp and they looked good. I tried with different ways of define my
geometry but it gives me the same results.<br>
</div>
<div><br>
</div>
<div>I put the Dirichlet condition as a constraint and the weak formulation is:<br>
</div>
<div>[Dof{d N} ,{d N} ]_inside the cylinder<br>
</div>
<div>+ [CompX[Normal[]] ,{N} ]_on the bases of the cylinder.<br>
</div>
<div><br>
</div>
<div>I am using getdp-3.2.0 and gmsh-4.4.1 for Windows64. I also tried with the version from the 1st of October of 2019 of ONELAB.<br>
</div>
<div><br>
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<div>I can't find what is wrong, I would be thankful if someone can help me. I attached the .geo and .pro files.<br>
</div>
<div><br>
</div>
<div>Thank you in advance.<br>
</div>
<div>Isabel.<br>
</div>
<span></span><br>
</div>
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<div>--</div>
<div>François Henrotte Dr Ir - <span style=""><a href="mailto:francois.henrotte@uclouvain.be">francois.henrotte@uclouvain.be</a></span><span style=""> - </span><span style=""><a href="mailto:francois.henrotte@uliege.be">francois.henrotte@uliege.be</a> </span></div>
<div>UCLouvain - Bât. Euler a.217 - Av. G. Lemaître 4-6 , <span style="">B-1348 Louvain-la-Neuve - </span><span style="">+32(0)10 47 23 64 </span></div>
<div><span style="">ULiège - Institut Montefiore I154 - Allée de la Découverte 10, B-4000 Liège - +32(0)4 366 37 36 </span></div>
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