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[Name] C3DEEI [Files to download] software user manual [Annotation] 
We work with the system of equations describing non-stationary inviscid compressible fluid flow in 3D, i.e. the Euler equations, and we focus on the numerical solution of these equations and on the boundary conditions. In particular, we choose the implicit finite volume method. Many boundary conditions (i.e. fixed, linearized) bring non-physical errors into the solution, slowing down the convergent process, or even ruining the solution in the whole domain. We use the analysis of the Riemann problem for the construction of the boundary conditions in order to match the experimental data. We show, that the unknown one-side initial condition for the local Riemann problem can be partially replaced by the suitable complementary condition. We suggest such complementary conditions (by preference of pressure, velocity, total quantities,...) giving physically relevant data. Our method for the construction of the boundary conditions is robust and its use accelerates the solver convergence to the desired solution. As a part of this work we present own-developed software for the solution of the 3D Euler equations, using the implicit method.
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