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Modeling Transient Flows-A Pratical Guide.pdf

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Modeling Transient Flows-A Pratical Guide

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Modeling Transient Flows

A Practical Guide

Frank Kelecy

Fluent Inc.

June 10, 2004

2 / 117

Agenda

 Motivation and Goals

 Algorithms

 Segregated Solver

 Coupled Solvers

 Setting Up Unsteady Problems

 Solving and Post-processing

 New Algorithms for Fluent 6.2

 Physical Models and Unsteady Flows

 Summary

 Appendix

 Additional Material on Solver Features and Physical Models

 Examples + Validations

3 / 117

Motivation

 Nearly all flows in nature are unsteady!

 Steady-state assumption is possible if we…

 Ignore unsteady fluctuations

 Employ ensemble/time-averaging to remove

unsteadiness (e.g. turbulence modeling)

 In CFD, steady-state methods are preferred

 Lower computational cost

 Easier to post-process and analyze

 Many applications, however, require resolution of unsteady flow

4 / 117

Typical Applications

 Aerodynamics (aircraft, land vehicles,etc.)

 Vortex shedding

 Rotating Machinery

 Rotor-stator interaction

 Rotating stall, surging

 Multiphase Flows

 Free surface motions

 Bubble dynamics (fluidized beds, bubble columns)

 Deforming Domains

 In-cylinder combustion

 Store separation

 Unsteady Heat Transfer

 Transient heating, cooling

5 / 117

Origin of Unsteady Flow

 “Natural” unsteadiness

 Unsteady flow due to growth of instabilities within the fluid

 Examples: high Reynolds number flows over blunt obstacles, natural

convection flows

 “Forced” unsteadiness

 Time-dependent boundary conditions, source terms drive the unsteady flow

field

 Examples: pulsing flow in a nozzle, rotor-stator interaction in a turbine stage

Natural convection (tempertaure field)

Rotor-stator interaction in an axial compressor

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