CFD lecture 21 - Computational Fluid Dynamics Lecture 21 In...

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Computational Fluid Dynamics Lecture 21 In flow B.C.’s and Forcing Often in CFD it is desired to simulate a steady or ongoing flow. Examples include: Spatially developing Jet. Wave breaking on beach ph C These situations require some kind of continuous forcing of the large scale flow features. There are two major approaches to accomplish this. 1. In flow Boundary Conditions 2. Forcing the flow inside the domain. Several complex issues arise for both methods. Inflow Boundary Conditions At the boundary there may be characteristics propagating both in and out. 1
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The common (wrong) approach is to set the B.C. to only the inflow condition: e.g. Jet – Dirichlet Condition ( ) 01 0, , uyyy tU < <= There are two problems with this. 1. Turbulent fluctuations from within the domain (pressure, velocity, density) can send signals back upstream faster than U and if not allowed to exit, will experience 100% reflection at the upstream boundary.
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This note was uploaded on 06/08/2011 for the course EOC 6850 taught by Professor Slinn during the Spring '07 term at University of Florida.

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CFD lecture 21 - Computational Fluid Dynamics Lecture 21 In...

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