1.3.17 Oblique shock reflections

Product: ABAQUS/Explicit  

This example illustrates the use of the ideal gas equation of state model and adaptive meshing in modeling shock wave interaction problems that involve both regular and Mach reflection processes.

Problem description

Adaptive meshing

An elongated Eulerian adaptive mesh domain is used. The wedge-shaped obstruction is located in the middle portion of the domain where the shock refections take place. The Eulerian inflow and outflow boundaries are located far enough upstream and downstream from the obstruction to prevent undesired reflections. The mesh for the middle portion of the domain is held in place for the purpose of showing results by applying adaptive mesh constraints at the entry and exit planes of this subdomain. These constraints are in addition to spatial adaptive mesh constraints used at the Eulerian boundaries. Because the gas flow is substantial, the intensity of adaptive meshing must be increased to provide an accurate solution. The value of the MESH SWEEPS parameter is increased from the default of 1 to 5.

Results and discussion

Input file

References

Figures

Figure 1.3.17–1 The sequence of shock reflections occurring when a plane shock wave encounters a wedge-shaped obstruction in a two-dimensional channel.

Figure 1.3.17–2 Schematic drawing of the model (CPE4R elements).

Figure 1.3.17–3 Vector plots of the velocity resultant in the middle portion of the domain for different intermediate times.

Figure 1.3.17–4 Pressure contours corresponding to the velocity resultant shown in Figure 1.3.17–3.