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September 9, 2020, 07:12 |
High performance car simulation
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#1 |
New Member
Ana
Join Date: Sep 2020
Posts: 10
Rep Power: 5 |
Good morning everyone,
I am trying to run a simulation of a high-performance car and right now I am trying to make a mesh study. However, I have some doubts that I would really appreciate some help with. I have calculated the first prism layer height for a y+=1 (0.0103mm) and taken 20% of the total boundary layer height for my simulation (14mm). I have chosen a stretching factor of 1.2 and 12 prism layers. How do these numbers sound?? I am using an airspeed of 40m/s. Star-ccm+ doesn't allow you to insert the first prism layer height if you want to set up a stretching factor, so I have been playing with the stretching factor and the number of layers to get the first height similar to the one I calculated. Does this approach make sense?? Should I have selected a higher y+? I am expecting to have an important boundary separation, so that is why I decided to use that small value. I have then selected the K-omega SST low y+ treatment, but I am getting reversed flow on the outlet region of my block and a high number of cells with turbulent viscosity limited. what does it mean?? When should I use low y+ treatment and when all y+ treatment?? Thank you very much in advance for the help |
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Tags |
boundary layer, car, turbulent models, wall treatment, y+ value |
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