Numerical simulation of gas microflows

The paper considers numerical simulation of unsteady gas flow through a microscopic hole into a space filled with an equilibrium gas, taking into account the effects of strong nonequilibrium and sparsity.The kinetic Boltzmann equation for the distribution function in the form of BGC is solved by the method of discrete velocities. Integration of a non-stationary equation in time within one time step allows us to obtain an algebraic formulation representing the process of evolution of the system in the form of a sequence of flights and collisions.The main results of calculations are presented in the form of graphical distributions that clearly demonstrate the course of the microjet flow depending on the gas rarefaction parameter. The Compaq Visual Fortran programming environment is used for modeling.