Study of capabilities of hybrid scheme for advection terms approximation in mathematical models of compressible flows

  • M.V. Kraposhin (ISP RAS, Moscow, Russia)
Abstract.

The hybrid method for approximation of advective terms is proposed in order to resolve flows in the wide Mach numbers region. This hybrid method is based on the Kurganov- Tadmor (KT) scheme and projection method PISO (Pressure Implicit with Splitting Operators). In order to study hybrid method properties a set of cases with analytical solution or experimental data for different classes of flows was considered: a) compressible flows – propagation of the wave in straight channel (Sod’s Problem), supersonic flow over flat wedge, supersonic flow over backward step, flow over forward step with supersonic velocities, flow in supersonic converging-diverging nozzle with shock wave; b) incompressible flows – subsonic flow of laminar viscous fluid in the channel with circle cross section, flow around cylinder in laminar and turbulent regimes, mixing of two gases in 2D flat channel; c) industrial and academic verification tests – superisonic flow of air in NASA nozzle for pressure ratio 5, expansion of stationary equilibrium hot plasma in vacuum; d) qualitative assessment of the hybrid method adequacy for industrial cases – numerical simulation of flows in high speed micro- compressor, simulation of two-phase flow in liquid ring pump. All materials are available for public access through GitHub project.

Keywords: mathematical models; numerical simulation; numerical schemes; compressible flows; acoustics; computational fluid dynamics; open source software.
Edition: Proceedings of the Institute for System Programming, vol. 28, issue 3, 2016, pp. 267-326.
DOI: 10.15514/ISPRAS-2016-28(3)-16
ISSN: ISSN 2220-6426 (Online), ISSN 2079-8156 (Print)