RANS Modeling has too much dissipation -- CFD Online Discussion Forums

January 31, 2015, 12:30	RANS Modeling has too much dissipation	#1
smartsoldier New Member Jacob Join Date: Apr 2014 Posts: 23 Rep Power: 12	I am attempting to capture the shedding vorticies off the rear of an Ahmed body in 2-D, however since it is only 2-D I cannot use LES simulations and instead must use a RANS turbulence model. The problem is that since they are "averaged-NS-eqns" I am not seeing any periodic shedding, it simply damps out. I have tried various different models and wall enhancements, and have changed my mesh y+ from 1-30 but no change is observed in the transient shedding. Any suggestions?

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