This project analyses the steady-state flow around an isolated building. The aim is to validate the flow around the building against experiments carried out at the Japan Wind Institute [1]. An atmospheric boundary layer profile is implemented at the inflow.
The numerical simulation results of SimScale were compared with the experimental results.
The geometry is a rectangular block which was created based on the physical setup.
Fig.1. Physical setup and atmospheric boundary condition [2].
Analysis type and Domain
The “Hex-dominant parametric (only CFD)” tool was used to mesh the domain. Different mesh refinements were applied to get a good quality mesh.
Tool Type : OPENFOAM®
Analysis Type : Incompressible Steady-state (Turbulent)
Mesh and Element types :
Mesh type
Number of volumes
Type
Hex-dominant parametric
1.411×107
3D hex
Simulation Setup
Fluid:
Air with kinematic viscosity of 1.5×10−5kg/ms
is assigned as the domain fluid. The boundary conditions for the simulation are shown in Table 2.
Boundary Conditions:
Parameter
Top, Left and right
Inlet
Outlet
Building and bottom walls
Velocity
Slip wall
From File
Zero Gradient
No-Slip wall
Pressure
Slip wall
Zero Gradient
0.0Pa
Zero Gradient
k
Slip wall
Same as Initial value
Zero Gradient
Wall Functions
omega
Slip wall
Same as Initial value
Zero Gradient
Wall Functions
The velocity at inlet is assigned through the file-upload option provided on the platform. The file corresponds to the velocity profile provided by experiments [1].
Results
The numerical simulation results of longitudinal velocity at different planes are compared with experimental results provided in study [1].
Fig.2. Comparison of numerical and experimental results of longitudinal velocity [1].Fig.3. Velocity streamlines imposed on pressure contours.
This offering is not approved or endorsed by OpenCFD Limited, producer and distributor of the OpenFOAM software and owner of the OPENFOAM® and OpenCFD® trade marks. OPENFOAM® is a registered trade mark of OpenCFD Limited, producer and distributor of the OpenFOAM software.
Last updated: January 8th, 2021
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