VMFL053

VMFL053
Compressible Turbulent Mixing Layer

Overview

Reference

S.G. Goebel, J.C. Dutton. “Experimental Study of Compressible Turbulent Mixing Layers”. AIAA Journal, Vol. 29, pp. 538-546, 1991

SolverAnsys Fluent
Physics/Models

Turbulence: RNG k-ε model, compressible, energy equation

Input File
VMFL053_FLUENT.cas for Ansys Fluent
Project FilesLink to Project Files Download Page

Test Case

Two streams of air are mixed in a rectangular tunnel. The length of the computational domain is chosen such that the local Reynolds number at the exit of the test section, which is based on the velocity difference between the streams and the mixing layer thickness, is greater than 100,000. This is the Reynolds number needed for the complete development of the mixing layer.

Figure 131: Flow Domain

Flow Domain

Material PropertiesGeometry Boundary Conditions

Air:

Density: Ideal Gas
Specific Heat: 1006.43 J/kg-K
Thermal Conductivity: 0.0242 W/m-K
Viscosity: 1.4399e-05 kg/m-s

Dimensions of the domain:

300 mm X 72 mm

Primary Stream (1):

Total Pressure = 487 kPa
Static Pressure = 36 kPa
Total Temperature = 360 K
Mach Number = 2.35
Turbulent Kinetic Energy = 74 m2/s2
Turbulent Dissipation Rate = 62,300 m2/s3

Secondary Stream (2):

Total Pressure = 37.6 kPa
Static Pressure = 36 kPa
Total Temperature = 290 K
Mach Number = 0.36
Turbulent Kinetic Energy = 226 m2/s2
Turbulent Dissipation Rate = 332,000 m2/s3

Analysis Assumptions and Modeling Notes

The flow is steady, turbulent, and compressible. The RNG k-ε model is used for turbulence.

Results Comparison

The velocity profiles as the mixing layer evolves are compared with the experimental data.

Figure 132: X Velocity Profiles at x = 50 mm

X Velocity Profiles at x = 50 mm