reverse flow at the outlet

khalidansari4u · October 15, 2014, 11:54

hello,

i m working on flow past a rotationally oscillating cylinder.

and i m using udf and dynamic mesh for it. so when i m using udf file and running the calculation. it is constantly giving me reverse flow at the outlet.
and the solution doesnt converge. pls help me experts.

plsss.

i extended the outlet far from the cylinder. used 2nd order upwind momentum equation.

samurai_01 · October 18, 2014, 01:53

Which boundary condition did you use. My guess is you have used Pressure outlet BC (given your problem is at low RE, if its a compressible flow problem, then its a different game altogether). Try using outflow instead.

October 15, 2014, 11:54	reverse flow at the outlet	#1
khalidansari4u New Member Khalid Ansari Join Date: Apr 2014 Posts: 8 Rep Power: 12	hello, i m working on flow past a rotationally oscillating cylinder. and i m using udf and dynamic mesh for it. so when i m using udf file and running the calculation. it is constantly giving me reverse flow at the outlet. and the solution doesnt converge. pls help me experts. plsss. i extended the outlet far from the cylinder. used 2nd order upwind momentum equation.

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October 18, 2014, 01:53		#2
samurai_01 Member Join Date: Oct 2012 Posts: 46 Rep Power: 14	Which boundary condition did you use. My guess is you have used Pressure outlet BC (given your problem is at low RE, if its a compressible flow problem, then its a different game altogether). Try using outflow instead.