VMFL047

VMFL047
Turbulent Flow with Separation in an Asymmetric Diffuser

Overview

Reference

C. U. Buice, J. K. Eaton. “Experimental Investigation of Flow Through an Asymmetric Plane Diffuser”. Journal of Fluids Engineering. Vol. 122, pp. 433-435, 2000

SolverAnsys Fluent, Ansys CFX
Physics/Models

Turbulent separation, standard k-ω model

Input File
VMFL047_FLUENT.cas for Ansys Fluent
VMFL047_CFX.def for Ansys CFX
Project FilesLink to Project Files Download Page

Test Case

Turbulent flow with gradual separation and reattachment is modeled in an asymmetric 2-D diffuser. The lower wall of the diffuser is divergent with an angle of 10° and expands to about 4.7 times the inlet height.

Figure 118: Flow Domain

Flow Domain

Material PropertiesGeometry Boundary Conditions

Density: 1 kg/m3

Viscosity: 0.0001 kg/m-s

Inlet height H = 2 M

Outlet height = 4.7 H

Angle of the divergent section = 10°

Length of the straight section after divergence = 21 H

Fully developed turbulent profile for velocity at inlet with an average velocity = 0.7041 m/s

Analysis Assumptions and Modeling Notes

Steady turbulent flow.

Results Comparison for Ansys Fluent

Figure 119: Comparison of X-Velocity at X = 24.4 m

Comparison of X-Velocity at X = 24.4 m

Results Comparison for Ansys CFX

Figure 120: Comparison of X-Velocity at X = 24.4 m

Comparison of X-Velocity at X = 24.4 m