# UDS formulation for axisymmetric domains URGENT

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 April 7, 2008, 14:05 UDS formulation for axisymmetric domains URGENT #1 Sandilya Garimella Guest   Posts: n/a Hello All I am trying to solve for UDS in Fluetn with an Axisymmetric model But the UDS theory is given for 2D models but not for axisymmetric models I am not sure what to do!!! Should I write UDF for a 2D domain using theory given in Fluent Manual and incorporate the same into my axi-symmetric model Please let me know Thank you. Regards Sandilya

 April 8, 2008, 03:15 Re: UDS formulation for axisymmetric domains URGEN #2 Aris Nikolopoulos Guest   Posts: n/a Yes, it's the same! There are some minor differences though in axisymetric! Not in UDS but in all UDFs. For example be carefull with some functions (C_VOLLUME) because sometimes multiply their output with (2*PI)

 April 10, 2008, 09:19 Re: UDS formulation for axisymmetric domains URGEN #3 Sandilya Garimella Guest   Posts: n/a thank you very. The reason for my question is that i am solving for electric potential and charge transport in bulk gas flow In a 2d model the equations converge But in Axisymmetric setting, the charge transport equation diverges immediately I am not able to understand the reason

 April 14, 2008, 04:32 Re: UDS formulation for axisymmetric domains URGEN #4 Rami Guest   Posts: n/a You should look at the UDS as a tensor scalar transport equation. Then, you can explicitly write it in ANY coordinate system (including 2D Cartesian, axisymmetric etc). All you need is to know how the tensor terms, like covariant derivatives, are presented in your system. For axisymmetric cylidrical system, you may find these equations in most texbooks, and maybe even in Fluent documentation.

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