Circumeferential averaged velocity

afarkas · September 4, 2017, 05:31

Hello,

I am doing a simulation for calculating a nominal wake distribution behind a ship model within STAR-CCM+.
I would like to obtain Circumferential Average of velocity for specified radius, i.e. line integral of x velocity component for radii: 0.2R, 0.3R, etc.
The problem is that within line integral report, user must specify a part (or part surface) and I don't know how to select a cells that lie on some radius.

Does anyone know how to calculate a nominal wake distribution? Should i create some derived parts?

Thank you for your help

FluentStarter · September 4, 2017, 07:07

Hi Afarkas,

I would do it like this:

- Create a cylindrical coordinate system where the z-axis corresponds to the axis around which you want to rotate
- Create a plane that is normal to the z-axis
- Create a cylindrical section (attach it only to the plane section you created before!)
- If you take care that you choose the right coordinate system u should see a line after entering a radius
- Now make a surface average on the line

afarkas · September 4, 2017, 07:35

Thank you for your reply.

It worked.

Best regards

September 4, 2017, 05:31	Circumeferential averaged velocity	#1
afarkas New Member Andrea Join Date: Jul 2017 Posts: 4 Rep Power: 8	Hello, I am doing a simulation for calculating a nominal wake distribution behind a ship model within STAR-CCM+. I would like to obtain Circumferential Average of velocity for specified radius, i.e. line integral of x velocity component for radii: 0.2R, 0.3R, etc. The problem is that within line integral report, user must specify a part (or part surface) and I don't know how to select a cells that lie on some radius. Does anyone know how to calculate a nominal wake distribution? Should i create some derived parts? Thank you for your help

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September 4, 2017, 07:07		#2
FluentStarter Member Join Date: Apr 2014 Location: N/A Posts: 47 Rep Power: 12	Hi Afarkas, I would do it like this: - Create a cylindrical coordinate system where the z-axis corresponds to the axis around which you want to rotate - Create a plane that is normal to the z-axis - Create a cylindrical section (attach it only to the plane section you created before!) - If you take care that you choose the right coordinate system u should see a line after entering a radius - Now make a surface average on the line

September 4, 2017, 07:35		#3
afarkas New Member Andrea Join Date: Jul 2017 Posts: 4 Rep Power: 8	Thank you for your reply. It worked. Best regards