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boundary condition for impulsive start

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Old   January 7, 2008, 05:40
Default boundary condition for impulsive start
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sekar
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hi, I have developed a code for cartesian grid method. It gives good results for flow past circular cylinder. Now I want to simulate flow past an impulsively started airfoil. Can any one help me in specifying boundary condition for velocity for an impulsively started flow? Thanks for your advice
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Old   January 7, 2008, 06:23
Default Re: boundary condition for impulsive start
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Sachin Paramane
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You apply U=1, and V=0 as an Initial condition in the domain keep the boundary conditions as it is. Sachin
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Old   January 7, 2008, 13:16
Default Re: boundary condition for impulsive start
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sekar
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hi sachin, thank you for your reply.. but by applying U=1 and V=0 how can we represent the impulsive motion? shouldn't the boundary condition be time dependent?
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Old   January 7, 2008, 15:06
Default Re: boundary condition for impulsive start
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ag
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Assuming a Galilean transformation, it doesn't really matter whether you start the fluid impulsively past a fixed boundary (Sachin's approach) or you impulsively start the body into a fixed fluid (your approach). Sachin's recommendation is easier.
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