Modification of the Eta-Invariant Code for Application on a Modular Grid Network

摘要

Extensive modifications to the Eta-Invariant code for computation of tubular projectile flowfields are reported. An efficient modular grid network is implemented consisting of a fine mesh near the projectile, a coarse mesh on the interior of the projectile, and a coarse mesh on the exterior region. The conventional implicit factored integration scheme in delta form is modified to allow for block tridiagonal inversion along a line which crosses from one mesh to another. Special intermesh operators are derived for implementation of this idea at the intermesh points and their immediate neighbors. Complex applications topology of various block inversions are discussed in detail.