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For cyclic boundary conditions, which of these should be equated?

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in Computational Fluid Dynamics by (118k points)
For cyclic boundary conditions, which of these should be equated?

(a) The flow variables

(b) Gradient of the flow variables

(c) Flux of the flow variables

(d) Second derivative of the flow variables

I have been asked this question in semester exam.

My doubt is from Boundary Conditions in portion Boundary Conditions of Computational Fluid Dynamics

1 Answer

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Correct choice is (c) Flux of the flow variables

The explanation: The flux of the flow variables in the inlet cyclic boundary should be matched with that of the outlet cyclic boundaries to apply a cyclic boundary. For example the flux of Φ1,j and Φn-1,j

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