VMFL030

VMFL030
Turbulent Flow in a 90° Pipe-Bend

Overview

Reference

M.M. Enayet, M.M. Gibson, A.M.K.P. Taylor, M. Yianneskis, “Laser-Doppler Measurements of Laminar and Turbulent Flow in a Pipe Bend”. Znt. J. Heat & Fluid Flow, Vol 3. pp. 213-219, 1982

Solver Ansys Fluent

Physics/Models 3-D Turbulent flow with separation, RNG k-ε model with non-equilibrium wall functions

Input File

pipebnd-rng-noneq.cas

Project Files Link to Project Files Download Page

Test Case

Turbulent flow through a 90° circular pipe bend is modeled. The flow separates and reattaches around the bend. Due to symmetry of the flow field only half of the domain is modeled. Velocity profile at an angle of 75° (as measured from the inlet) is used to validate the simulation.

Figure 78: Flow Domain

Material Properties	Geometry	Boundary Conditions
Density: 1 kg/m³ Viscosity: 2.3256 x 10^-05 kg/m-s	Radius of the pipe = 0.5 m	Inlet velocity: Fully developed turbulent profile for z-velocity. Non components in other directions

Material Properties

Geometry

Boundary Conditions

Density: 1 kg/m³

Viscosity: 2.3256 x 10^-05 kg/m-s

Radius of the pipe = 0.5 m

Inlet velocity: Fully developed turbulent profile for z-velocity.

Non components in other directions

Analysis Assumptions and Modeling Notes

The flow is steady. RNG k-ε is used to model turbulence along with non-equilibrium wall functions.

Results Comparison for Ansys Fluent

Figure 79: Comparison of Velocity Magnitude (m/s) at 75° Along the Bend