کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
521925 | 867798 | 2012 | 20 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: An Asymptotic-Preserving all-speed scheme for the Euler and Navier–Stokes equations An Asymptotic-Preserving all-speed scheme for the Euler and Navier–Stokes equations](/preview/png/521925.png)
We present an Asymptotic-Preserving ‘all-speed’ scheme for the simulation of compressible flows valid at all Mach-numbers ranging from very small to order unity. The scheme is based on a semi-implicit discretization which treats the acoustic part implicitly and the convective and diffusive parts explicitly. This discretization, which is the key to the Asymptotic-Preserving property, provides a consistent approximation of both the hyperbolic compressible regime and the elliptic incompressible regime. The divergence-free condition on the velocity in the incompressible regime is respected, and an the pressure is computed via an elliptic equation resulting from a suitable combination of the momentum and energy equations. The implicit treatment of the acoustic part allows the time-step to be independent of the Mach number. The scheme is conservative and applies to steady or unsteady flows and to general equations of state. One and two-dimensional numerical results provide a validation of the Asymptotic-Preserving ‘all-speed’ properties.
Journal: Journal of Computational Physics - Volume 231, Issue 17, 1 July 2012, Pages 5685–5704