Wind around buildings

¶ WindAroundBuildings

Summary of the case, Wind around buildings
Item Value/Name
Mesh Block mesh for the volume field (fluid domain) and hexahedral for (around) the buildings
Flow type steady-state
turbulent by ras (standard k-ε model)
Solver simpleFoam

1. Pre-Processing

The hexahedral mesh is generated on the basis of the Obj file of the buildings.

Obj-file of the buildings
The block mesh is generated for the volume field for fuild domain (bounding box). The size of the bounding box is 350[m] x 280[m] x 140[m].

2. Settings

The initial and boundary conditions are set for the inlet which is located in the YZ-plane at x=-20 (the outlet is the opposite side and at x=330), and the internal field.

Have a read on the turbulent kinetic energy (k) and the dissipation (ε) here.

Initial/boundary conditions, Wind around buildings
Item Initial/Boundary Value/Name
Inlet of flow velocity (U) initial and boundary uniform, (10, 0, 0) [m/s]
Outlet of flow velocity (U) initial and boundary uniform, (0, 0, 0) [m/s]
Flow velocity (U) in the Internal field initial uniform, (0, 0, 0) [m/s]
Inlet of turbulent kinetic energy (k) initial and boundary uniform, 1.5 [m2/s2]
Outlet of turbulent kinetic energy (k) initial and boundary uniform, 1.5 [m2/s2]
Turbulent kinetic energy (k) in the Internal field initial uniform, 1.5 [m2/s2]
Inlet of dissipation (ε) initial and boundary uniform, 0.03 [m2/s3]
Outlet of dissipation (ε) initial and boundary uniform, 0.03 [m2/s3]
Dissipation (ε) in the Internal field initial uniform, 0.03 [m2/s3]

3. Simulation

4. Post-Processing

The following figures show a time-lapse distribution of flow speed (U, not scaled) in each plane view (XY, XZ, upstream-YZ, downstream-YZ from the top).

XY-plane view at Time=0 sec.
Time-lapse of flow speed in the XY-plane.
XZ-plane view at Time=0 sec.
Time-lapse of flow speed in the XZ-plane.
Upstream YZ-plane view at Time=0 sec.
Time-lapse of flow speed in the upstream YZ-plane.
Time-lapse of flow speed in the downstream YZ-plane.

5. Analysis

¶ k_and_epsilon

5.1 Turbulent kinetic energy, k

Turbulent kinetic energy at z=1[m].
Turbulent kinetic energy at z=10[m].
Turbulent kinetic energy at z=40[m].
Turbulent kinetic energy at z=70[m].

5.2 Dissipation, ε

Epsilon at z=1[m].
Epsilon at z=10[m].
Epsilon at z=40[m].
Epsilon at z=70[m].

Elbow

¶ Elbow

Summary of the case, Elbow
Item Value/Name
Mesh Original: polygon by Fluent
2D
Flow type transient
laminar
Newtonian
Solver icoFoam

1. Pre-Processing

2D meshing for Elbow

2. Settings

3. Simulation

4. Post-Processing

Flow in the elbow by vector(velocity)-display