Hi, I have done DES simulation on tall building structures. In this simulation, Cp[ PRESSURE COEFFICIENT] contours and Graph are showing in negative sign. Is the simulation is correct? Please do comment if found any error.
Boundary conditions:
Velocity=13.6 m/s
Length of building = 0.7 m
A building can have -ve Cp value along with a +ve Cp value (see link).
Please update your reference values.The V_inf in your Cp is taken from reference value.
https://www.google.co.in/search?q=PRessure+coefficient+around+a+buildings&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjki-Ooy9bLAhUFPo4KHQXyCokQsAQIHg&biw=1366&bih=629#imgrc=WpLiw9n6JJhEMM%3A
@ Abdul aziz... i given reference valve is 1 ........... ok i plot after. thanks for respones
if your geometry is symmetry then change the velocity direction into -x and you should gain the same result with positive sign. if such a thing wouldnt happen then you should change your set up.
should notice that it must be positive in any circumstance,
I would suggest you to validate your simulations with existing wind tunnel data. This should give you a rough idea on the number of cells required.
Once the validation is done, perform simulations for new building shapes. I would also suggest using DDES instead of DES to minimize MSD/GIS.
Refer to the AIJ website: http://www.aij.or.jp/jpn/publish/cfdguide/index_e.htm
They have validation cases to verify the models.
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