VMFL016

VMFL016
Turbulent Flow in a Transition Duct

Overview

Reference D.O. Davis, F.B. Gessner, “Experimental Investigation of Turbulent Flow Through a Circular-to-Rectangular Transition Duct”. AIAA Journal, Vol 30, pp. 367-375, 1992

Solver Ansys Fluent

Physics/Models 3–D Turbulent flow with separation, Reynolds stress model

Input Files

tranduct-rsm-1.cas

Project Files Link to Project Files Download Page

Test Case

Turbulent flow through a circular-to-rectangular transition duct having the same inlet and outlet cross-sectional areas is modeled. The curvature of the duct walls induces a strong pressure-driven cross-flow that develops into a counter-rotating vortex pair near the short side walls of the duct. Due to symmetry of the flow field, only one fourth of the duct is modeled (as shown in Figure 39: Flow Domain). Station 5 is located 23 m downstream of the inlet.

Figure 39: Flow Domain

Material Properties	Geometry	Boundary Conditions
Density: 1 kg/m³ Viscosity: 5.13X10^–6 kg/m-s	Inlet radius = 1 m Length of duct = 35 m	Inlet velocity: 1 m/s

Material Properties

Geometry

Boundary Conditions

Density: 1 kg/m³

Viscosity: 5.13X10^–6 kg/m-s

Inlet radius = 1 m

Length of duct = 35 m

Inlet velocity: 1 m/s

Analysis Assumptions and Modeling Notes

The flow is steady. Reynolds Stress Model (RSM) is used to model turbulence.

Results Comparison for Ansys Fluent

Figure 40: Comparison of Pressure Coefficient at Station 5

Figure 41: Comparison of Pressure Coefficient Along Centerline of the Duct