VMFL037

Overview

Reference S. Baker. “Regions of Recirculating Flow Associated with Two-Dimensional Steps”. Ph.D. Thesis. Department of Civil Engineering, University of Surrey. UK. 1977.

Solver Ansys Fluent, Ansys CFX

Physics/Models SST model, turbulent flow with separation and reattachment

Input File

VMFL037_ffstep.cas for Ansys Fluent

ffstep.def for Ansys CFX

Project Files Link to Project Files Download Page

Test Case

Turbulent flow over a forward facing step is modeled. The flow undergoes separation and reattachment.

Figure 94: Flow Domain

Material Properties	Geometry	Boundary Conditions
Density = 1.02 kg/m³ Viscosity = 1.5 X 10^-5 kg/m-s	Step height H = 0.0758 m	Inlet Velocity = 9.7 m/s Outer boundary (in transverse direction) is modeled as slip wall

Material Properties

Geometry

Boundary Conditions

Density = 1.02 kg/m³

Viscosity = 1.5 X 10^-5 kg/m-s

Step height H = 0.0758 m

Inlet Velocity = 9.7 m/s

Outer boundary (in transverse direction) is modeled as slip wall

Analysis Assumptions and Modeling Notes

The flow is steady. Pressure coefficient, C_p on the wall is calculated with reference to the pressure at point upstream of the step at coordinates as indicated in Figure 94: Flow Domain.

Results Comparison for Ansys Fluent

Figure 95: Comparison of Pressure Coefficient Along the Wall

Results Comparison for Ansys CFX

Figure 96: Comparison of Pressure Coefficient Along the Wall