[qsx4881]

Dear all,
I am simulating thermal stratification in pipe.
In piping systems where hot and cold fluids flow in, two fluid layers can be formed due to the difference in fluid density (or temperature). Such a phenomenon is called thermal stratification. When this is the case, the cold (denser) fluid occupies the lower position of the pipe while the hot fluid occupies the upper space.
In my computational domain, cold water(denser) enters through the left inlet with a velocity of 15.852m/s, while hot water enters through the up inlet with a velocity of 0.0175m/s,0Pa at the outlet. See the figure. I use k-epsilon model. In order to simulate the phenomena of thermal stratification, gravity need to be considered. So I select the buoyancy model.
The question is CFX computational results does not meet the actual physical laws. But I can get a good result with Fluent. The interface of cold water and hot water should be approximate horizontal. See the following pictures. The above picture is the result of CFX ,bottom Fluent. I do not know why I get the wrong results whth CFX, there is something wrong in my setting? I have uploaded the ccl file. Please help!
Thanks in advance!