Mathematical and software support for 3D mathematical modeling of the airflow impact on the optical-mechanical unit mounted in the aircraft unpressurized compartmentстатья
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Дата последнего поиска статьи во внешних источниках: 17 января 2018 г.
Аннотация:The problem of three-dimensional mathematical modelling of the effect of air flow on an
optical-mechanical unit (OMU) located in the unpressurised compartment of the aircraft,
is considered. To solve this problem, a mathematical model of gas dynamics based on the
solution of a complete system of Navier - Stokes equations that describe the dynamics of a
turbulent, spatially unsteady flow of a viscous gas is developed. The software for simulating
the process of flow past a WMU model in the aircraft compartment was created. The
effect of the air flow on the OMU is described by the torque acting on the OMU from the
air flow side. A numerical method for solving the three-dimensional gasdynamic problem is
presented. The numerical method is based on the numerical high order Godunov scheme,
realized on an irregular grid with arbitrary cells (tetrahedral, prismatic shape). Flows of
conservative variables are calculated by solving the Riemann problem with an approximate
AUSM method. The system of equations is supplemented by a two-parameter k-eps model of
turbulence, modified for the calculation of high-speed compressible flows. To significantly
reduce the cost of computing resources, it is suggested to use stochastic models of the effect
of air flow on WMU. A general simulation algorithm is described.