{"id":164639,"date":"2023-03-17T08:58:16","date_gmt":"2023-03-17T08:58:16","guid":{"rendered":"\/knowledge\/forums\/topic\/how-to-evaluate-the-difference-of-a-local-variable-to-its-circumferential-averaged-value-on-a-turbo-surface\/"},"modified":"2023-07-31T12:25:58","modified_gmt":"2023-07-31T12:25:58","slug":"how-to-evaluate-the-difference-of-a-local-variable-to-its-circumferential-averaged-value-on-a-turbo-surface","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-evaluate-the-difference-of-a-local-variable-to-its-circumferential-averaged-value-on-a-turbo-surface\/","title":{"rendered":"How to evaluate the difference of a local variable to its circumferential averaged value on a Turbo Surface?"},"content":{"rendered":"

This can be achieved with the following steps: \u00e2\u20ac\u00a2 Initialize the turbo components \u00e2\u20ac\u00a2 Generate a Turbo Surface: Location > Turbo Surface \u00e2\u20ac\u00a2 Define the Turbo Surface as required, e.g.: o Geometry > Method > Constant Streamwise Location o Color – Variable: Velocity – Circ Average: Length – Max Samples: 100 o Apply \u00e2\u20ac\u00a2 When you click on \u00e2\u20ac\u0153\u00e2\u20ac\u00a6\u00e2\u20ac\u009d a new variable named \u00e2\u20ac\u0153Velocity LCA on Turbo Surface 1\u00e2\u20ac\u009d occurs * \u00e2\u20ac\u00a2 Create an Expression: Insert > Expression > exp1 = Velocity – Velocity LCA on Turbo Surface 1 > Apply \u00e2\u20ac\u00a2 Create a Variable: Insert > Variable > var1 > Expression: exp1 > Apply \u00e2\u20ac\u00a2 Go to the Turbo Surface again o Variable: var1 o Circ Average: None o Apply The difference is now displayed on the turbo surface. * The abbreviation LCA means circumferentail averaging by length: When the Circ. Average setting is set to Length, circumferential averaging of values at a sampling point is carried out internally by forming a circular arc, centered about the turbo axis, passing through the sampling point. Values are interpolated to n equally-spaced locations along the arc, using values from nearby nodes, where n is a number that is inversely proportional to the mesh length scale, and limited by the Max. Samples setting. The n values are then averaged in order to obtain a single, circumferentially-averaged value for the sampling point.<\/p>\n","protected":false},"template":"","class_list":["post-164639","topic","type-topic","status-publish","hentry","topic-tag-4653","topic-tag-cfd-post","topic-tag-fluid-dynamics","topic-tag-general","topic-tag-rotating-machinery"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t