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ANSYS12.0官方培训教程 Fluent Chapter10-Transient Flow Modeling.ppt

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ANSYS12.0官方培训教程 Fluent Chapter10-Transient Flow Modeling

Transient Flow Modeling 10-* ANSYS, Inc. Proprietary ? 2009 ANSYS, Inc. All rights reserved. April 28, 2009 Inventory #002600 Training Manual 10-* ANSYS, Inc. Proprietary ? 2009 ANSYS, Inc. All rights reserved. April 28, 2009 Inventory #002600 Chapter 10Transient Flow Modeling Introductory FLUENT Training Motivation Nearly all flows in nature are transient! Steady-state assumption is possible if we: Ignore transient fluctuations Employ ensemble/time-averaging to remove unsteadiness (this is what is done in modeling turbulence) In CFD, steady-state methods are preferred Lower computational cost Easier to postprocess and analyze Many applications require resolution of transient flow: Aerodynamics (aircraft, land vehicles,etc.) – vortex shedding Rotating Machinery – rotor/stator interaction, stall, surge Multiphase Flows – free surfaces, bubble dynamics Deforming Domains – in-cylinder combustion, store separation transient Heat Transfer – transient heating and cooling Many more. Origins of Transient Flow Naturally occurring transients transient flow due to growth of instabilities within the fluid or a non-equilibrium initial fluid state Examples: natural convection flows, turbulent eddies of all scales, fluid waves (gravity waves, shock waves) Forced transients Time-dependent boundary conditions, source terms drive the transient flow field Examples: pulsing flow in a nozzle, rotor-stator interaction in a turbine stage Kelvin-Helmholtz Cloud Instability Buoyant Box Falling Into a Pool of Water Transient CFD Analysis Simulate a transient flow field over a specified time period Solution may approach: Steady-state solution – Flow variables stop changing with time Time-periodic solution – Flow veriables fluctuate with repeating pattern Your goal may also be simply to analyze the flow over a prescribed time interval. Free surface flows Moving shock waves Etc. Extract quantities of interest Natural frequencies (e.g. Strouhal Number) Time-averaged and/or RMS values Tim