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May 16, 2014, 11:09 |
Large length scales
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#1 |
New Member
Ava
Join Date: Nov 2013
Location: UK
Posts: 17
Rep Power: 12 |
Hi every body
I am doing wind resource assessment in a urban area around a couple of buildings. I will be using LES for turbulence simulation and upstream wind data from meteorological measurements including wind profile and length scale. The dimensions of the computational domain that I am simulating is 212 mx163m x 89m (in streamwise, spanwise and normal directions). This is while the length scale profile that I have been given changes from around 2 (close to the ground) up to 90 m. Do you think that such a big length scale can cause numerical instabilities (and probably divergence) in my solution)? my other question is that I am trying to generate structured mesh using ansys/icem around the buildings as I guess it is more robust and can provide more accurate results for LES simulations but it is really time consuming. Will I pay a big penalty if I switch to unstructured mesh? would unstructured mesh influence the convergence of the solution? thank you very |
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