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Old   November 23, 2004, 04:10
Default torque
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Dear All,

Does any body have an idea, how to calulate torque in a mixer. Is there any way in STAR-CD to get torque directly. If any body has related udf, please could you post it.


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Old   November 29, 2004, 05:54
Default Re: torque
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Torque can be calculated by knowing wall force data. If you want to calculate the power consumed by the mixer u need to know wall forces to calculate torque. 1. Create a cylindrical co-orinate system at centre of rotor. 2. Get wall forces (ftot). If they are not stored run the analysis for one more iteration by switching on wall force post data. Prostar will create walls (shells) 3. Select rotor walls only. Then in newly created co-ordinate system getc ftot again. Get cells redial data. get torque.


psys 5 ! cylindrical co-ordinate system at centre

getw,ftot,p,absolute !stores ftot for CSET in 4th register

oper,getw,x,5,3 !stores radius in 3rd register

oper mult 2 3 6 !stores torque in 6th register

oper smul 0.001 6 6 !0.001 scalling factor

*get torque rtot 6 ! total torque
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