Published March 23, 2023 | Version v1
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CALCULATION SCHEME FOR THE MATTER CONSERVATION EQUATION

Authors/Creators

  • 1. National Research University TIIAME
  • 2. University of Texas at Austin

Description

The finite-difference scheme of directed differences (the Courant-Isaacson-Ries scheme), which is widely used in the practice of aerohydrodynamic calculations, is studied theoretically and on the example of test problems. We applied the commonly used in practice Courant-Isakson-Ries directional difference scheme that allowed us to find and show distributions of velocities where the laws of the matter conservation are violated in the calculations in solving the matter conservation equations or the correspondence of the obtained solutions to the most general practical understandings on the essence of the matter transfer. A scheme free from the shortcomings of the Courant-Isaacson-Ries scheme has been constructed, tested, and proposed for use in aerohydrodynamic calculations by the finite difference method. Moreover, all the valuable properties of this well-known scheme are preserved. Among the maintained properties: transportability, conservatism, stability in calculations, invariance, adequacy of the essence of the physical phenomenon of the transfer of matter in space. The disadvantages of the new finite-difference scheme proposed for solving the equations of conservation of matter should be considered: an increase in the required RAM for storing electronic means of calculating information about the velocity field in memory and an increase in the number of calculations needed. However, this is an insignificant price to pay for guaranteed conservatism in calculations while maintaining all other valuable properties of calculation schemes. A more stable behavior of the solution in the calculations will allow increasing the time steps so much that the losses in the number of calculations become not noticeable.

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