UDF for Solid.gas and slip velocity in each cell

Capricorn · January 18, 2016, 02:51

I have a periodic domain of 0.64x0.64 m with 512x512 grid points. I want to calculate solid velocity,gas velocity and slip velocity in each cell. Can anyone provide UDF for this kind of problem or can anyone guide me a little. Is it even possible?

`e` · January 18, 2016, 03:03

Use the cell macros for velocity (C_U, C_V, C_W) and use the thread of the respective phase (solid phase thread, gas phase thread). This question has been asked many times before.

Capricorn · January 18, 2016, 03:12

Thank you for your reply. I was wondering if it is possible in Fluent without UDF??

`e` · January 18, 2016, 05:13

Velocities of the separate phases as well as the mixture are available in the graphics and animations section. Have a read of "Postprocessing for Multiphase Modeling" in the users guide for step by step instructions.

As for the slip velocity between the two phases, have a look through the variables to see if it's listed but otherwise you may need to write a UDF to calculate this velocity difference. Alternatively, you could export the velocities of the two phases and calculate the difference in another program.

djing · April 7, 2017, 12:45

Hello dear colleague ,

Thank you for the help , I would like to ask you if you know any macro which can be used in order to give the values of velocity in each cell center of the inlet boundary condition ?
I will be very grateful if you can help me ...

Thank you .

January 18, 2016, 02:51	UDF for Solid.gas and slip velocity in each cell	#1
Capricorn New Member Join Date: Dec 2015 Posts: 8 Rep Power: 11	I have a periodic domain of 0.64x0.64 m with 512x512 grid points. I want to calculate solid velocity,gas velocity and slip velocity in each cell. Can anyone provide UDF for this kind of problem or can anyone guide me a little. Is it even possible?

January 18, 2016, 05:13		#4
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	Velocities of the separate phases as well as the mixture are available in the graphics and animations section. Have a read of "Postprocessing for Multiphase Modeling" in the users guide for step by step instructions. As for the slip velocity between the two phases, have a look through the variables to see if it's listed but otherwise you may need to write a UDF to calculate this velocity difference. Alternatively, you could export the velocities of the two phases and calculate the difference in another program. Capricorn likes this.

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January 18, 2016, 03:03		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	Use the cell macros for velocity (C_U, C_V, C_W) and use the thread of the respective phase (solid phase thread, gas phase thread). This question has been asked many times before.

January 18, 2016, 03:12		#3
Capricorn New Member Join Date: Dec 2015 Posts: 8 Rep Power: 11	Thank you for your reply. I was wondering if it is possible in Fluent without UDF??

April 7, 2017, 12:45		#5
djing New Member Join Date: Sep 2011 Posts: 15 Rep Power: 15	Hello dear colleague , Thank you for the help , I would like to ask you if you know any macro which can be used in order to give the values of velocity in each cell center of the inlet boundary condition ? I will be very grateful if you can help me ... Thank you .