The New Incompressible Flow Capabilities in LS-DYNA

Over the past year, efforts have been underway to extend LS-DYNA’s extensive list of capabilities to include an incompressible CFD solver. The focus of this paper is on the second-order approximate projection method used in LS-DYNA to solve the time-dependent Navier-Stokes equations. In order to address the computational demands of the implicit pressure field, LS-DYNA relies, in part, upon an A-conjugate projection technique coupled with the preconditioned conjugate gradient method and sub-domain preconditioners. Results of time-dependent laminar and large-eddy simulations are used to illustrate the effectiveness of the projection-based preconditioned conjugate gradient method coupled with the second- order approximate projection flow solver. As a new physics option in LS-DYNA, the incompressible flow solver complements the existing compressible fluid/ALE simulation capabilities.