THE ANALYSIS OF THE BOUNDARY CONDITIONS FOR THE COMPRESSIBLE GAS FLOW AS A MODIFICATION OF THE RIEMANN PROBLEM

Abstract eng:
The correct design of the boundary conditions plays an important role in the computational fluid dynamics (CFD). We present a special construction of the boundary conditions in order to match the experimental data. We work with the system of equations describing non-stationary compressible turbulent fluid flow (2D,3D), i.e. the Reynolds-Averaged Navier-Stokes (RANS) equations, and we focus on the numerical solution of these equations and on the boundary conditions. The boundary values (for the density, velocity, pressure) must satisfy the considered system of equations. Many boundary conditions (i.e. fixed, linearized) don’t satisfy this eligible demand, and bring non-physical errors into the solution, slow down convergent process, and may even ruin the solution in the whole domain. In our general approach we seek the boundary values as the solution of the incomplete initial-value problem complemented with various given data. This approach can be used within various methods in CFD.

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