{"id":164495,"date":"2023-03-17T08:57:53","date_gmt":"2023-03-17T08:57:53","guid":{"rendered":"\/knowledge\/forums\/topic\/i-have-negative-volumes-being-generated-how-can-this-be-avoided\/"},"modified":"2023-07-31T12:25:41","modified_gmt":"2023-07-31T12:25:41","slug":"i-have-negative-volumes-being-generated-how-can-this-be-avoided","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-negative-volumes-being-generated-how-can-this-be-avoided\/","title":{"rendered":"I have negative volumes being generated. How can this be avoided?"},"content":{"rendered":"<p>Negative volumes in TurboGrid can often be caused by too many layers being generated.  A B-spline is used to connect corresponding nodes in each layer together.  Wiggles in the B-spline due to many layers close together can generate negative volumes.  Try to first reduce the number of layers.  Under Layers in the tree outline, set Intermediate Layers Insertion Mode to Manual-Uniform and select a reasonable number of layers (5-6).  If this doesn&#8217;t resolve the issue, change the Spanwise Mesh Interpolation Guide Curves Type from Automatic to Piece-wise linear.<\/p>\n","protected":false},"template":"","class_list":["post-164495","topic","type-topic","status-publish","hentry","topic-tag-2022-r1","topic-tag-cfx-turbogrid","topic-tag-fluid-dynamics","topic-tag-general","topic-tag-turbogrid","topic-tag-turbomachinery"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Negative volumes in TurboGrid can often be caused by too many layers being generated. A B-spline is used to connect corresponding nodes in each layer together. Wiggles in the B-spline due to many layers close together can generate negative volumes. Try to first reduce the number of layers. Under Layers in the tree outline, set\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-negative-volumes-being-generated-how-can-this-be-avoided\/\" \/>\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 Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"I have negative volumes being generated. How can this be avoided? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"Negative volumes in TurboGrid can often be caused by too many layers being generated. A B-spline is used to connect corresponding nodes in each layer together. Wiggles in the B-spline due to many layers close together can generate negative volumes. Try to first reduce the number of layers. Under Layers in the tree outline, set\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-negative-volumes-being-generated-how-can-this-be-avoided\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-03-17T08:57:53+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T12:25:41+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"I have negative volumes being generated. How can this be avoided? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Negative volumes in TurboGrid can often be caused by too many layers being generated. A B-spline is used to connect corresponding nodes in each layer together. Wiggles in the B-spline due to many layers close together can generate negative volumes. Try to first reduce the number of layers. 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