Mathematical and software support for 3D mathematical modelling of the airflow impact on the optical-mechanical unit mounted in the aircraft unpressurized compartment
DOI:
https://doi.org/10.14529/mmp170411Keywords:
optical-mechanical unit, mathematical modelling, the eects of air flow.Abstract
The problem of three-dimensional mathematical modelling of the eect of air ow 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 ow of a viscous gas is developed. The software for simulating the process of ow past a WMU model in the aircraft compartment was created. The eect of the air ow on the OMU is described by the torque acting on the OMU from the airow 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-model of turbulence, modied for the calculation of high-speed compressible ows. To signicantly reduce the cost of computing resources, it is suggested to use stochastic models of the eect of air ow on WMU. A general simulation algorithm is described.References
Sobol V.R. The Mathematical Methods for Modelling of the Impact of Airflow on OpticalMechanical Unut Based on the Results of Field Experiments.Advances of Modern Electronics, 2014, no. 4, pp. 53-57. (in Russian)
Goryainov A.V., Ivanov I.E., Semenikhin K.V. Identification of a Statistical Model of Atmospheric Disturbances Acting on the Optical-Dynamic Unit Placed on the Aircraft's Board During It's Flight.Abstracts of IV-th scientific and technical conference of young
scientists and specialists "Actual problems of development of systems and tools ADS", Jointstock company GSKB Almaz-Antey. 26-28 September 2013. (in Russian)
Weiss J.M., Maruszewski J.P., Smith W.A. Implicit Solution of Preconditioned Navier - Stokes Equations Using Algebraic Multigrid.The American Institute of Aeronautics and Astronautics Journal, 1991, vol. 37, no 1, pp. 29-36.
Sarkar S., Erlebacher G., Hussaini M.Y., Kreiss H.O. The Analysis and Modelling of Dilatational Terms in Compressible Turbulence.Journal of Fluid Mechanics, 1991, vol. 227, pp. 473-493.
Chen Y.-S., Kim S.-W.Computation of Turbulent Flows Using an Extended k-ε Turbulence Closure Model. NASA Contractor Report, 179204, 1987.
Chieng C.C., Launder B.E. On the Calculation of Turbulent Heat Transport Downstream from an Abrupt Pipe Expansion.Numerical Heat Transfer, 1980, vol. 3, pp. 189-207.
Liou M.S., Stefen C.J. A New Flux Splitting Scheme.Journal of Computational Physics, 1993, vol. 107, pp. 23-39.
Glushko G.S., Ivanov I.E., Kryukov I.A. Method for Computation of Turbulent Supersonic Flows.Mathematical Models and Computer Simulations, 2010, vol. 2, no. 4, pp. 407-422. (in Russian)
