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kylafree

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[ÇóÖú] FLUENT UDF HELPÖйØÓÚÌݶȵÄÃèÊöÊÇʲôÒâ˼£¿

´ó¼ÒºÃ£¬FLUENT UDF HELPÖйØÓÚGradient (G)ÓëReconstruction Gradient (RG£©ÓÐÈçÏÂÃèÊö£º

Gradient (G) and Reconstruction Gradient (RG) Vector Macros

You can access gradient and reconstruction gradient vectors (and components) for many of the cell variables listed in Table 3.2.8. ANSYS FLUENT calculates the gradient of flow in a cell (based on the divergence theory) and stores this value in the variable identified by the suffix _G. For example cell temperature is stored in the variable C_T, and the temperature gradient of the cell is stored in C_T_G. The gradients stored in variables with the _G suffix are non-limited values and if used to reconstruct values within the cell (at faces, for example), may potentially result in values that are higher (or lower) than values in the surrounding cells. Therefore, if your UDF needs to compute face values from cell gradients, you should use the reconstruction gradient (RG) values instead of non-limited gradient (G) values. Reconstruction gradient variables are identified by the suffix RG, and use the limiting method that you have activated in your ANSYS FLUENT model to limit the cell gradient values.

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The gradients stored in variables with the _G suffix are non-limited values and if used to reconstruct values within the cell (at faces, for example), may potentially result in values that are higher (or lower) than values in the surrounding cells. Therefore, if your UDF needs to compute face values from cell gradients, you should use the reconstruction gradient (RG) values instead of non-limited gradient (G) values.

[ Last edited by kylafree on 2012-2-20 at 17:01 ]
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