A finite volume Chimera method for fast transient dynamics in compressible flow problems
Résumé
This article deals with fast transient dynamics of compressible flows in which local flow details
matter. An overlapping grid Chimera method is proposed in a finite volume framework. Euler’s
equations are considered, as well as explicit time integration with a second order discretization
in time and space. The method is intended to improve the accuracy of a large scale calculation
by adding a local grid containing important flow details that alter the flow within the global
grid. This paper evaluates the impact of the Chimera exchange on flow dynamics crossing the
overlapping grid interface. The proposed Chimera method is assessed using five well-known
test cases from the literature. With a second order interpolated solution inside the receiving
cells, the method does not alter the order of convergence of the global model. It is able to
deal with complex compressible flow structures as well as multi-component flows, and produces
numerical solutions with better quality when using a finer local model compared to a single grid
computation, providing significant gains in terms of CPU time and memory usage.
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