{"id":46642,"date":"2017-09-27T11:19:28","date_gmt":"2017-09-27T11:19:28","guid":{"rendered":"\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/"},"modified":"2017-09-27T11:19:28","modified_gmt":"2017-09-27T11:19:28","slug":"compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/","title":{"rendered":"Compute the derivative of an arbitrary varaible in a FLUENT UDF"},"content":{"rendered":"<p>User can set a dummy user defined scalar (do not need to solve that UDS), assign the varible he wants to compute the gradient to that UDS. Then use the following udf: #include &#8220;udf.h&#8221; DEFINE<em>EXECUTE<\/em>AT<em>END(my<\/em>adjust) { Domain *d=Get<em>Domain(1); Thread *t; cell<\/em>t c; thread<em>loop<\/em>c(t,d) { begin<em>c<\/em>loop(c,t) C<em>UDSI(c,t,0)=C<\/em>U(c,t); end<em>c<\/em>loop(c,t) } Alloc<em>Storage<\/em>Vars(d, SV<em>UDSI<\/em>RG(0), SV<em>UDSI<\/em>G(0), SV<em>NULL); Scalar<\/em>Reconstruction(d, SV<em>UDS<\/em>I(0), -1, SV<em>UDSI<\/em>RG(0), NULL); Scalar<em>Derivatives (d, SV<\/em>UDS<em>I(0), -1, SV<\/em>UDSI<em>G(0), SV<\/em>UDSI<em>RG(0), NULL); thread<\/em>loop<em>c(t,d) { begin<\/em>c<em>loop(c,t) { C<\/em>UDMI(c,t,0)=C<em>UDSI<\/em>G(c,t,0)[0]; C<em>UDMI(c,t,1)=C<\/em>UDSI<em>G(c,t,0)[1]; C<\/em>UDMI(c,t,2)=C<em>UDSI<\/em>G(c,t,0)[2]; } end<em>c<\/em>loop(c,t) } Free<em>Storage<\/em>Vars(d,SV<em>UDSI<\/em>RG(0), SV<em>UDSI<\/em>G(0), SV_NULL); }<\/p>\n","protected":false},"template":"","class_list":["post-46642","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"User can set a dummy user defined scalar (do not need to solve that UDS), assign the varible he wants to compute the gradient to that UDS. Then use the following udf: #include &quot;udf.h&quot; DEFINEEXECUTEATEND(myadjust) { Domain *d=GetDomain(1); Thread *t; cellt c; threadloopc(t,d) { begincloop(c,t) CUDSI(c,t,0)=CU(c,t); endcloop(c,t) } AllocStorageVars(d, SVUDSIRG(0), SVUDSIG(0), SVNULL); ScalarReconstruction(d, SVUDSI(0), -1,\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Compute the derivative of an arbitrary varaible in a FLUENT UDF | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"User can set a dummy user defined scalar (do not need to solve that UDS), assign the varible he wants to compute the gradient to that UDS. Then use the following udf: #include &quot;udf.h&quot; DEFINEEXECUTEATEND(myadjust) { Domain *d=GetDomain(1); Thread *t; cellt c; threadloopc(t,d) { begincloop(c,t) CUDSI(c,t,0)=CU(c,t); endcloop(c,t) } AllocStorageVars(d, SVUDSIRG(0), SVUDSIG(0), SVNULL); ScalarReconstruction(d, SVUDSI(0), -1,\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2017-09-27T11:19:28+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2017-09-27T11:19:28+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Compute the derivative of an arbitrary varaible in a FLUENT UDF | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"User can set a dummy user defined scalar (do not need to solve that UDS), assign the varible he wants to compute the gradient to that UDS. 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Then use the following udf: #include \"udf.h\" DEFINEEXECUTEATEND(myadjust) { Domain *d=GetDomain(1); Thread *t; cellt c; threadloopc(t,d) { begincloop(c,t) CUDSI(c,t,0)=CU(c,t); endcloop(c,t) } AllocStorageVars(d, SVUDSIRG(0), SVUDSIG(0), SVNULL); ScalarReconstruction(d, SVUDSI(0), -1,","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/forum","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/forum\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/#listItem","name":"Compute the derivative of an arbitrary varaible in a FLUENT UDF"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/#listItem","position":3,"name":"Compute the derivative of an arbitrary varaible in a FLUENT UDF","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization","name":"Ansys Learning Forum","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/forum\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/","name":"Compute the derivative of an arbitrary varaible in a FLUENT UDF | Ansys Learning Forum","description":"User can set a dummy user defined scalar (do not need to solve that UDS), assign the varible he wants to compute the gradient to that UDS. 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Then use the following udf: #include &quot;udf.h&quot; DEFINEEXECUTEATEND(myadjust) { Domain *d=GetDomain(1); Thread *t; cellt c; threadloopc(t,d) { begincloop(c,t) CUDSI(c,t,0)=CU(c,t); endcloop(c,t) } AllocStorageVars(d, SVUDSIRG(0), SVUDSIG(0), SVNULL); ScalarReconstruction(d, SVUDSI(0), -1,","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/compute-the-derivative-of-an-arbitrary-varaible-in-a-fluent-udf\/","article:published_time":"2017-09-27T11:19:28+00:00","article:modified_time":"2017-09-27T11:19:28+00:00","twitter:card":"summary_large_image","twitter:title":"Compute the derivative of an arbitrary varaible in a FLUENT UDF | Ansys Learning Forum","twitter:description":"User can set a dummy user defined scalar (do not need to solve that UDS), assign the varible he wants to compute the gradient to that UDS. 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