fluent第一层网格高度选择论述.pdfVIP

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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 E n h a n c e d W a ll F u n c ti o n S ta n d a rd W a ll F u n c ti o n 5 Mandrusiak Near-wall Mesh Study June 28, 2010 GE Gasification Confidential Technical Information Model Output – TKE Profiles Enhanced Mesh Standard Mesh E n h a n c e d W a ll F u n c ti o n S ta n d a rd W a ll F u n c ti o n 6 Mandrusiak Near-wall Mesh Study June 28, 2010 GE Gasification Confidential Technical In

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