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Old   November 20, 2007, 19:59
Default non-reflecting boundary condition
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Shuo
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what are the non-reflecting condition (compressible flow) for the farfield boundaries in terms of density, pressure and velocity components?

Shuo
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Old   November 21, 2007, 00:34
Default Re: non-reflecting boundary condition
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Shuo
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I read a paper by K.W.Thompson Jour.Comp.Phys 68, 1987 which gave the non-reflecting characteristic equation in cartesian coordinates. I am working in cylindrical coordinates. Not sure how to convert it. Shuo
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Old   November 21, 2007, 14:54
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Harish
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There is a recent paper "Generalized Characteristic Boundary Conditions for Computational Aeroacoustics, Part 2" by Kim and Lee and also check the part 1 of it.Both the papers which are tension of the paper of Poinsot and Lele(1992,JCP) discuss the implementation of characteristic BC in generalized coordinates. I do not have their electronic version.
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Old   November 21, 2007, 17:44
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shuo
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What about the symmetry condition in x-r coordinates? Is that given as well?

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Old   November 21, 2007, 17:50
Default Re: non-reflecting boundary condition
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Harish
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The papers do not discuss the symmetry boundary condition but the implementation would be very similar to other BC where you define incoming characteristic in terms of outgoing characteristics.Hirsch has a discussion I think on the implementation of characteristics for symmetry.
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