Learning Forum

[MrFCA]

One more question. I put you in context. Right now I am doing aerodynamic simulations in 2D on a row of photovoltaic panels. My computational domain spans 240 meters longitudinally and 60 meters vertically (image attached). My main objective is to obtain the drag and lift coefficients on the first panel of the rows for both front and rear wind. I am testing with different turbulence models (k-omega SST and k-epsilon Realizable with non-equilibrium treatment) and a priori, I am obtaining good results for the front wind, however, for back wind I have seen differences of the order of 30% between both models. Analyzing the results, I have realized that these differences are due to the small pressure drop caused by the turbulence caused by the roughness of the ground (0.05 m). Although I know that it is because of this phenomenon that the difference between the two models of turbulence occurs, I wonder why that happens, since predicting the behavior of the ground using an appropriate y + should not be very complex and it is where I find the greatest differences between both models. Therefore, I wonder which of the two is the one that is generating the wrong results. I think the correct model is k-epsilon Realizable, more than anything, because the Reynolds number is high, but I'm not sure. Any ideas?nI attach some images.nBoundary conditionsnnResults k-epsilon Realizable Non-EquilibriumnTurbulence Kinetic EnergynRange GlobalnTurbulence Kinetic EnergynRange 0 -15 m2/s2nResults k-omega SSTnTurbulence Kinetic EnergynRange GlobalnTurbulence Kinetic EnergynRange 0 -15 m2/s2nAs you can see in the images, the flow is more developing for k-omega SST.n