Problems in velocity inlet

amarjogot · July 18, 2013, 16:27

Hello everyone. I am just having some problem with my model. My model is a cylinder (as shown in the figure). It has two different velocity component (one tangential and one radial). Can any one please tell me how can I input them in my model. Thanks in advance for your help.

Zoheb

siara817 · July 23, 2013, 10:23

You need to generate a local coordinates at the middle of your inlet and build a field function for each component (in x, y and z directions) of the velocity.

amarjogot · July 23, 2013, 13:31

Thank you very much for your help. I was trying to follow your suggestions, but still having some problem. I wrote my radial and tangential components as follows: 0.508*(position[2]^0.143 and .292*(position[2]^0.143. I got two errors. first it was not taking the power (^0.143) part. Showing some syntax error. Then when I removed this (although not right), it showed me some different errors.

error: unable to compute field function: radial velocity (radial velocity)
Cannot resolve function $${position}: "position" not defined.

Thanks in advance for your help.

siara817 · July 23, 2013, 16:33

For position and scalar properties you should put just one dollar sign.
Please search in the help of STAR-CCM : user defined field function or programming reference. Then you will find out how to write power and so on

amarjogot · July 25, 2013, 02:48

Thank you very much for your assistance. I will try to use your idea and will let you know definitely.

July 23, 2013, 10:23		#2
siara817 Senior Member siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 220 Rep Power: 18	You need to generate a local coordinates at the middle of your inlet and build a field function for each component (in x, y and z directions) of the velocity. __________________ Good luck Siamak

July 23, 2013, 16:33		#4
siara817 Senior Member siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 220 Rep Power: 18	For position and scalar properties you should put just one dollar sign. Please search in the help of STAR-CCM : user defined field function or programming reference. Then you will find out how to write power and so on __________________ Good luck Siamak

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July 23, 2013, 13:31		#3
amarjogot New Member shoumo Join Date: Jun 2013 Posts: 16 Rep Power: 13	Thank you very much for your help. I was trying to follow your suggestions, but still having some problem. I wrote my radial and tangential components as follows: 0.508(position[2]^0.143 and .292(position[2]^0.143. I got two errors. first it was not taking the power (^0.143) part. Showing some syntax error. Then when I removed this (although not right), it showed me some different errors. error: unable to compute field function: radial velocity (radial velocity) Cannot resolve function $${position}: "position" not defined. Thanks in advance for your help.

July 25, 2013, 02:48		#5
amarjogot New Member shoumo Join Date: Jun 2013 Posts: 16 Rep Power: 13	Thank you very much for your assistance. I will try to use your idea and will let you know definitely.