Examples

Rocstar Multiphysics Application

Example problems

1. Attitude motor control

The goal of this example is to assemble and run a moving-boundary, fluid--combustion coupled problem using Rocflo and Rocflu. The problem consists of a small (2 inch) attitude control motor, which is represented using a block-structured hexahedral mesh. A key aspect of this simulation is the regressing burning surface.

Attitude motor control model with pressure

2. Elastic piston

The goal of this example is to assemble and run a fully coupled fluid--solid interaction problem. It consists of an impulsive acceleration of a fluid--solid interface. This example uses the Rocstar packages Rocflo and Rocfrac. For this problem, Rocflo uses a block-structured, hexahedral grid to represent a 1 m cube that is pressurized to 150 kPa. Rocfrac uses an unstructured, 10-node, tetrahedral grid to represent a 1 m cube that is initially stress free.

Elastic piston model with pressure

3. Super seismic shock

The goal of this example is to assemble and run a fully coupled fluid--solid interaction problem with significant solid deformation. This problem deals with shock wave propagation causing solid deformation. Rocflo and Rocfrac are used to solve this problem, both using a block-structured, hexahedral grid.

Super seismic shock model showing pressure

4. Shock panel

The goal of this example is to assemble and run a fully coupled fluid--solid interaction problem that serves as a lightweight verification and validation case. This problem has a Mach 1.2 shock in air impacting a deforming panel. Rocflo is used as the solver in the fluid domain and uses a 10-block hexahedral mesh with 38 000 cells. The structures domain is solved by Rocfrac using a mesh with 138 000 quadratic tetrahedral elements.

Shock panel model showing pressure

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