Hi, I am trying to simulate a high rise building CFD using conjugate method (IBM). the domain boundary condition is defined symmetry and after simulation is complete, although the solution is converged; the results does not seem to be valid.
according to the vectors and velocity contours, the wind direction seems to be wrong.
project link:
Thanks for posting on the forum. I took a quick look at your project. My first impression is that the simulation itself seems fine with the current boundary conditions.
Some points to note:
Symmetry planes:
I think it makes sense to have the left and right face (of the building as seen from the inlet with z direction in vertical upward direction, see image below) as symmetry if you have similar buildings parallelly placed that you don’t want to simulate. The top face however, is better assigned as a slip wall rather than a symmetry face in my opinion. The results assume that an inverted building exists above the simulation domain with the current settings.
Inlet velocity vectors:
The velocity vectors near the inlet seem to obey the input boundary condition of the csv files with negative direction in both x and y. It is only downstream that the flow changes.
Convergence:
The simulation is successful regardless of the actual simulation’s resemblance to the actual expectation. In simple words, the solution checks for fixed parameters of convergence or maximum number of iterations for example as a reference for convergence. The results not necessarily make sense every time and this depends from case to case. Maybe you can tell us more about what results you are extremely curious to know and then a better convergence criteria can be manually decided from case to case.
Hope that helpful. Let us know how it works out or if you have any more questions!
