CFD_lab1-Exercise_Note

# CFD_lab1-Exercise_Note - Simulation and Validation of...

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1 Simulation and Validation of Turbulent Pipe Flows 57:020 Mechanics of Fluids and Transport Processes CFD LAB 1 By Tao Xing and Fred Stern IIHR-Hydroscience & Engineering The University of Iowa C. Maxwell Stanley Hydraulics Laboratory Iowa City, IA 52242-1585 1. Purpose The Purpose of CFD Lab 1 is to teach students how to use the CFD Educational Interface (FlowLab 1.2), practice more options in each step of CFD Process, and relate simulation results to EFD and AFD concepts. Students will simulate turbulent pipe flow following the “CFD process” by an interactive step-by-step approach. The flow conditions will be the same as they used in EFD Lab2. Students will have “hands - on” experiences using FlowL ab to compute axial velocity profile, centerline velocity, centerline pressure and friction factor. Students will compare simulation results with their own EFD data, analyze the differences and possible numerical/experimental errors, and present results in CFD Lab report. Flow chart for ISTUE teaching module for pipe flow (red color illustrates the options you will use in CFD Lab 1) Coarse Medium Fine Automatic Manual Structured Unstruct- ured Geometry Physics Mesh Total pressure drop Post-processing Wall friction Centerline Velocity Centerline Pressure Profiles of Axial Velocity Contours Vectors Streamlines Pipe Pipe Radius Pipe Length XY plot Validation Verification Boundary Conditions Flow Properties Viscous Models One Eq. Two Eq. Density and viscosity Laminar Turbulen Inviscid SA k-e k-w Heat Transfer? Incompress -ible? Initial Conditions Solve Iterations/ Steps Converge- nt Limit Precisions Single Double Numerical Schemes 1 st order upwind 2 nd order upwind Quick Steady / Unsteady? Report Residual

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2 2. Simulation Design In EFD Lab 2, you have conducted experimental study for turbulent pipe flow. The data you have measured include centerline pressure distribution and fully developed axial velocity profile. These data will be used in this Lab for comparisons with CFD predictions. The problem to be solved is that of turbulent flows through a circular pipe. Reynolds number based on pipe diameter and inlet velocity should be computed from your own EFD data and is much higher than the Reynolds number used in CFD Prelab1. The problem formulation is similar to that in CFD PreLab1 and will not be repeated here. The Reynolds number is much higher and students need specify turbulence model, and thus more variables need to be specified in boundary conditions, as will be discussed in details later. 3. CFD Process
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## This note was uploaded on 12/08/2011 for the course MECHANICS 57:020 taught by Professor Fredrickstern during the Fall '10 term at University of Iowa.

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CFD_lab1-Exercise_Note - Simulation and Validation of...

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