Learning Forum

[Keith Sequeira]

I am simulating jet blast in a domain 200m wide and tall , 500m in length. My mesh quality in terms of orthogonality and skweness are great. When i run the k-epsilon model i get temperautre and turbulence viscosity limited before continuity starts to diverge and i get a floating point error.

My model is essentially is a cylinder with the inlet at the far end. A domainis built around the cylinder with the dimensions mentioned about. The downstream wall of the domian is a pressure outlet, the left right and top walls are symmetry while the upstream end of the domain is a pressure outlet ( to represend the atmosphere )

 Flow of ari from the image is from the end of the pipes to the downstream wall on the right.

 

I have a boundary layer on the lower wall of the domain with a y+ 35 because i am investigating RANS turbulence models. I am not sure on what to do at this point because all my bondary conditions are corrct to my knowledge. Any and all help will be appreciated !

[Rob]

Please post some images of the flow field.

What is the fluid density model? Ie constant, ideal gas etc.