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how to calculate gradient through udf

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Old   October 26, 2017, 04:37
Default how to calculate gradient through udf
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I have to calculate gradient of velocity after each time step.and this gradient is used to define velocity at inletin next time step . I am using C_U_G(x,t)[0] within DEFINE_PROFILE but it's not working. please tell me how to use gradient suntax in udf.
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