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1
Mandrusiak Near-wall Mesh Study
June 28, 2010 GE Gasification Confidential Technical Information
Influence of Near-Wall Mesh
? Objective
– Quantify how near-wall mesh and boundary treatment affect
velocity and turbulent kinetic energy profiles
? Approach
– Simulate fully-developed turbulent flow in pipe
– Different mesh architectures
– Different mesh resolutions
– Different wall boundary treatments
– Compare profiles
? Key Findings
– Wall boundary mesh must match wall boundary condition
– Enhanced wall function provides most accurate results
2
Mandrusiak Near-wall Mesh Study
June 28, 2010 GE Gasification Confidential Technical Information
Model Description and Set-Up
Periodic
100mm
10 mm
Wall
Axis
dP/dx = -2000 Pa/m
? Standard k-e turbulence model
– Standard wall functions
– Enhanced wall functions
? Water flow
– Reynolds number ~ 38000
? Two mesh architectures and three levels of refinement
? Second-order differencing
? Steady-state analysis
– All residuals converge to 10-6
– Wall shear stress no longer changes
3
Mandrusiak Near-wall Mesh Study
June 28, 2010 GE Gasification Confidential Technical Information
Mesh Description
Enhanced Mesh Standard Mesh
Mesh 1
2X2 Mesh 1
4X4 Mesh 1
y+1 ~ 1.25
y+1 ~ 0.625
y+1 ~ 0.3125
y+1 ~ 125
y+1 ~ 62.5
y+1 ~ 31.25
200 cells
800 cells
1600 cells
400 cells
1600 cells
6400 cells
4
Mandrusiak Near-wall Mesh Study
June 28, 2010 GE Gasification Confidential Technical Information
Model Validation – Velocity Profiles
Enhanced Mesh Standard Mesh
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Mandrusiak Near-wall Mesh Study
June 28, 2010 GE Gasification Confidential Technical Information
Model Output – TKE Profiles
Enhanced Mesh Standard Mesh
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Mandrusiak Near-wall Mesh Study
June 28, 2010 GE Gasification Confidential Technical In
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