pressure coefficient greater than one

ajayvarma5 · February 23, 2016, 02:10

Im using fluent for analyzing flow on a 2d wing. my flow speeds are around 30m/s . solver settings are : pressure based, k-w SST, boudary conditions are
velocity inlet , pressure outlet,top(wall),bottom(wall),aerofoil (wall). i have done modeling in icem cfd with 7lakh quad mesh and i have used farfield distance for about 5 times of the chord due to computational constraints. i m having problem with increase in the angle of attack.that is pressure coeffiecient value is going higher than that of 1 when i increase my angle to 4 degree. can someone pls help me

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LuckyTran · February 24, 2016, 02:21

Check your reference values. Make sure you have specified the correct reference velocity, length, etc.

ajayvarma5 · April 2, 2016, 03:17

how should we calculate reference values, if there is any way please kindly specify thank you

February 23, 2016, 02:10	pressure coefficient greater than one	#1
ajayvarma5 New Member ajay varma Join Date: Dec 2015 Location: india Posts: 7 Rep Power: 11	Im using fluent for analyzing flow on a 2d wing. my flow speeds are around 30m/s . solver settings are : pressure based, k-w SST, boudary conditions are velocity inlet , pressure outlet,top(wall),bottom(wall),aerofoil (wall). i have done modeling in icem cfd with 7lakh quad mesh and i have used farfield distance for about 5 times of the chord due to computational constraints. i m having problem with increase in the angle of attack.that is pressure coeffiecient value is going higher than that of 1 when i increase my angle to 4 degree. can someone pls help me.

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February 24, 2016, 02:21		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,836 Rep Power: 68	Check your reference values. Make sure you have specified the correct reference velocity, length, etc.

April 2, 2016, 03:17		#3
ajayvarma5 New Member ajay varma Join Date: Dec 2015 Location: india Posts: 7 Rep Power: 11	how should we calculate reference values, if there is any way please kindly specify thank you