# CFD_Prelab1 - Simulation of Laminar Pipe Flows 57:020...

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Simulation of Laminar Pipe Flows 57:020 Mechanics of Fluids and Transport Processes CFD PRELAB 1 By Tao Xing and Fred Stern The University of Iowa C. Maxwell Stanley Hydraulics Laboratory Iowa City, IA 52242-1585 1. Purpose The Purpose of CFD PreLab 1 is to teach students how to use the CFD educational interface (FlowLab 1.2.10), be familiar with the options in each step of CFD Process, and relate simulation results to AFD concepts. Students will simulate laminar pipe flow following the “CFD process” by an interactive step-by-step approach. Students will have “hands-on” experiences using FlowLab to compute axial velocity profile, centerline velocity, centerline pressure, and friction factor. Students will compare simulation results with AFD data, analyze the differences and possible numerical errors, and present results in CFD Lab 1 report. Flow chart for ISTUE teaching module for pipe flow (red color illustrates the options you will use in CFD PreLab 1) 2. Simulation Design 1 Coarse Medium Fine Automatic Manual Structured Unstruct- ured Geometry Physics Mesh Total pressure drop Post-processing Wall friction force 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 Turbulent 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 Operating Condition Residual

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In EFD Lab 2, you conducted experimental study for turbulent pipe flow. The data you have measured will be used for CFD Lab 1. In CFD PreLab 1, simulation will be conducted only for laminar circular pipe flows, i.e. the Reynolds number is less than 2300. Reynolds number based on pipe diameter and mean inlet velocity is 654.75 in the current simulation. CFD predictions of friction factor and fully developed axial velocity profile will be compared with AFD data. Since the flow is axisymmetric we only need to solve the flow in a single plane from the centerline to the pipe wall. Boundary conditions need to be specified include inlet , outlet , wall , and axis , as will be described in details later. Uniform flow is specified at inlet, the flow will reach the fully developed regions after a certain distance downstream. No-slip boundary condition will be used on the wall and constant pressure for the outlet. Symmetric boundary condition will be applied on the pipe axis. Since the flow is laminar, turbulence models are not necessary. 3. CFD Educational Interface
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CFD_Prelab1 - Simulation of Laminar Pipe Flows 57:020...

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