RANS Simulations

The RANS simulations were performed initially for validation studies. In this regard, we selected the cases reported by Johnson and Wagner in a series of papers in the 1980's for both smooth and ribbed ducts under stationary and rotating conditions.

We have performed the following simulations to date:

1. Stationary and rotating duct with aspect ratio of 1, smooth walls, normal trips and inclined trips, and a range of Re, Ro, and buoyancy parameters. Results obtained compare well with the measurements reported by Wagner and Johnson. Figure 1 below shows the comparison between the measured and predicted heat transfer in a smooth three-legged passage with no-rotation. As may be seen, the agreement is quite good. We are currently exploring improved turbulence models, and using LES to help in the model validation.

Re=25000, Ro=0, Smooth, Leading wall

r pass 2nd pass 3ru pass

Re=25000, Ro=0, Smooth, Leading wall r pass 2nd pass 3ru pass

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