Space‐time finite element computation of compressible flows between moving components

Abstract

SUMMARYA numerical simulation capability for the injector flow of a regenerative liquid propellant gun (RLPG) is presented. The problem involves fairly complex geometries and two pistons in relative motion; therefore a stabilized space-time finite element formulation developed earlier and capable of handling flows with moving mechanical components is used. In addition to the specifics of the numerical method, its application to a 30 mm U P G test firing is discussed. The computational data from the simulation of this test case are interpreted to provide information on flow characteristics, with emphasis on the tendency of the flow to separate from the injection orifice boundary of the test problem. In addition, the computations provided insight into the behaviour of the flow entering the combustion chamber.

Simulation of flow problems with moving mechanical components, fluid-structure interactions and two-fluid interfaces

“…25,27 Although good comparison with experimental gun data was achieved, the simulation indicated no tendency of the flow to separate from the injection orifice boundary. Live firing tests indicate, however, that a reversal in the direction of flow between the pistons can occur.…”

Effect of a moving boundary on pulsatile flow of incompressible fluid in a tube

“…To the authors' knowledge the only numerical investigation involving the behaviour of pulsatile¯ow in a tube, having a time dependent motion of the wall is that of Wren et al (1995) in which the axisymmetric simulations were conducted for¯ow in a gun tube with the walls moving in a time-periodic manner and the¯uid occupying a complex, varying geometry. The numerical investigation presented here is for simple periodic pulsatile¯ow in a tube with a time dependent motion of the wall.…”

Computational engineering analysis with the new-generation space–time methods

“…Since its inception, the DSD/SST method has been applied to some of the most challenging flow problems with MBI. The classes of problems solved include the freesurface and multi-fluid flows [36,38,[44][45][46]49,61,[64][65][66][67][68][69], FOI [36][37][38]45,49,61,65,67,[70][71][72][73][74][75][76][77], aerodynamics of flapping wings [57][58][59][78][79][80], flows with solid surfaces in fast, linear or rotational relative motion [20,46,49,60,[81][82][83], compressible flows [49,65,77,[84][85][86], shallow-water flows [46,…”