{"id":161529,"date":"2023-01-25T07:16:12","date_gmt":"2023-01-25T07:16:12","guid":{"rendered":"\/knowledge\/forums\/topic\/i-would-like-to-solve-a-user-scalar-transport-equation-in-ansys-cfd-with-advection-and-zero-diffusion-when-i-set-diffusion-to-zero-there-is-an-error-how-can-i-eliminate-diffusion-and-still-solve-m\/"},"modified":"2023-07-31T12:35:27","modified_gmt":"2023-07-31T12:35:27","slug":"i-would-like-to-solve-a-user-scalar-transport-equation-in-ansys-cfd-with-advection-and-zero-diffusion-when-i-set-diffusion-to-zero-there-is-an-error-how-can-i-eliminate-diffusion-and-still-solve-m","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-would-like-to-solve-a-user-scalar-transport-equation-in-ansys-cfd-with-advection-and-zero-diffusion-when-i-set-diffusion-to-zero-there-is-an-error-how-can-i-eliminate-diffusion-and-still-solve-m\/","title":{"rendered":"I would like to solve a user scalar transport equation in ANSYS CFD with advection and zero diffusion. When I set diffusion to zero, there is an error.  How can I eliminate diffusion and still solve my transport equation with the flow?"},"content":{"rendered":"<p>The treatment of quantities that are exactly zero is subject to the math processor of the machine, if a divide by zero is encountered.  Warnings are issued to prevent this, or indicate that it is occurring.  Diffusion (even with significantly non-zero coefficients) is a very slow process, so the effects of a low diffusivity on the scalar streamlines will be negligible (unless the residence time is huge).    The best practice (to avoid the pitfalls of divide-by-zero calculations), is to set the diffusivity to something just above machine round-off, (ie: 1.0e-15), and solve with double precision.<\/p>\n","protected":false},"template":"","class_list":["post-161529","topic","type-topic","status-publish","hentry","topic-tag-19-2","topic-tag-additional-variables","topic-tag-avs","topic-tag-cfx","topic-tag-compressible-flow","topic-tag-fluid-dynamics","topic-tag-general","topic-tag-modeling-setup-advice"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"The treatment of quantities that are exactly zero is subject to the math processor of the machine, if a divide by zero is encountered. Warnings are issued to prevent this, or indicate that it is occurring. 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Warnings are issued to prevent this, or indicate that it is occurring. 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How can I eliminate diffusion and still solve my transport equation with the flow?","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-would-like-to-solve-a-user-scalar-transport-equation-in-ansys-cfd-with-advection-and-zero-diffusion-when-i-set-diffusion-to-zero-there-is-an-error-how-can-i-eliminate-diffusion-and-still-solve-m\/"}],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["23.56.168.180"],"_bbp_last_active_time":["1-24-2023  20:20:18"],"_btv_view_count":["1044"],"siebel_km_number":["2056955"],"product_version":["19.2"],"km_published_date":["2018-11-16T01:59:17.000Z"],"family":["Fluid Dynamics"],"application_name":["CFX"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161529","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161529\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=161529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}