VMFL004

VMFL004
Plain Couette Flow with Pressure Gradient

Overview

Reference B.R. Munson, T.H. Okiishi, W.W. Huebsch, Fundamentals of Fluid Mechanics, 5th Edition, Wiley, 2006

Solver Ansys Fluent, Ansys CFX

Physics/Models Laminar flow, moving wall, periodic boundaries

Input Files

couette_flow.cas for Ansys Fluent

Couette_Flow.def for Ansys CFX

Project Files Link to Project Files Download Page

Test Case

Viscous flow between two parallel plates is modeled. The top plate moves with a uniform velocity while the lower plate is fixed. A pressure gradient is imposed in a direction parallel to the plates.

Figure 4: Flow Domain

Material Properties	Geometry	Boundary Conditions
Density = 1 kg/m³ Viscosity = 1 kg/m-s	Length of the domain = 1.5 m Width of the domain = 1 m	Velocity of the moving wall = 3 m/s in X-direction For Ansys Fluent, pressure gradient across periodic boundaries = -12 Pa/m For Ansys CFX, pressure gradient across periodic boundaries = -12 Pa/m (pressure change = –18 Pa)

Material Properties

Geometry

Boundary Conditions

Density = 1 kg/m³

Viscosity = 1 kg/m-s

Length of the domain = 1.5 m

Width of the domain = 1 m

Velocity of the moving wall = 3 m/s in X-direction

For Ansys Fluent, pressure gradient across periodic boundaries = -12 Pa/m

For Ansys CFX, pressure gradient across periodic boundaries = -12 Pa/m (pressure change = –18 Pa)

Analysis Assumptions and Modeling Notes

The flow is steady and laminar. Periodic conditions with specified pressure drop are applied across the flux boundaries.

Results Comparison for Ansys Fluent

Figure 5: Comparison of X-Velocity (m/s) at a Section Where X = 0.75 m

Results Comparison for Ansys CFX

Figure 6: Comparison of X-Velocity (m/s) at a Section Where X = 0.75 m