simulation of the turbulent flow in a 3d channel and over a surface mounted cube
DESCRIPTION
Simulation of the turbulent flow in a 3D channel and over a surface mounted cube. Youngwook Kang, Cornell University Andrei Simion, The Cooper Union Svetlana V. Poroseva, CSIT, Florida State University. Objectives. To become proficient in using Fluent and Gambit To get experience in: - PowerPoint PPT PresentationTRANSCRIPT
Simulation of the turbulent flow in a 3D channel and over a surface
mounted cube
Youngwook Kang, Cornell UniversityAndrei Simion, The Cooper Union
Svetlana V. Poroseva, CSIT, Florida State University
Objectives
• To become proficient in using Fluent and Gambit
• To get experience in:
1. acquiring numerical solutions of PDE 2. solving a CFD problem
Problem Description
Study on the influence of different side wall boundary conditions on flow characteristics in a 3D geometry.
- Flow types 1. Flow in a rectangular channel 2. Flow over a surface mounted cube
- Boundary Conditions 1. Periodic 2. Solid
• Channel Geometry: 2h in height, 2h in flow direction, and 3h in spanwise direction. (h=0.025m)• Channel with surface mounted cube:
• Fluid: air
Data from Hussain and Marinuzzi’s experiment (1996) was used.
800002Re hUb
Flow Geometry
smS
UdSUb /37.23
Turbulence Models
T
jj
k
T
T
k
kC
kPC
tDD
xU
tDDkP
tDkD
kC
CCCk
2
21
2
21
/
3.1 0.1 92.1 44.1 09.0 :model
itymean veloc - raten dissipatio -
energy kinetic -
iU
k
Numerical Procedure - 2nd order spatial discretization scheme - Segregated, implicit solver
- Steady flow - Boundary Conditions 1. Walls in z direction 2. Walls/Periodic in x direction 3. Channel: Periodic inlet/outlet 4. Cube: Fully developed channel flow (inlet) and convective outlet
Grid - Structured non-uniform with clustering near walls
- With such grid resolution, wall description with wall functions; focus on mean velocity profiles.
Channel (x:z) 47:41
Cube (x:z:y) 47:41:86
Channel Plots
Channel Plots (cont.)
Surface Mounted Cube Plots
Surface Mounted Cube Plots (cont.)
Surface Mounted Cube Plots (cont.)
Contours
Contours (cont.)
Results and Conclusion
• We have learned how to use Fluent and Gambit to design simple meshes and solve CFD problems in application to turbulence modeling.
• Different boundary conditions on side walls have a great influence on the flow characteristics, such as velocity, vorticity, and turbulent kinetic energy.