Verification assessment of piston boundary conditions for Lagrangian simulation of compressible flow similarity solutions
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Mississippi State Univ., Mississippi State, MS (United States)
- Univ. of Maine, Orono, ME (United States)
This work is concerned with the use of similarity solutions of the compressible flow equations as benchmarks or verification test problems for finite-volume compressible flow simulation software. In practice, this effort can be complicated by the infinite spatial/temporal extent of many candidate solutions or “test problems.” Methods can be devised with the intention of ameliorating this inconsistency with the finite nature of computational simulation; the exact strategy will depend on the code and problem archetypes under investigation. For example, self-similar shock wave propagation can be represented in Lagrangian compressible flow simulations as rigid boundary-driven flow, even if no such “piston” is present in the counterpart mathematical similarity solution. The purpose of this work is to investigate in detail the methodology of representing self-similar shock wave propagation as a piston-driven flow in the context of various test problems featuring simple closed-form solutions of infinite spatial/temporal extent. The closed-form solutions allow for the derivation of similarly closed-form piston boundary conditions (BCs) for use in Lagrangian compressible flow solvers. Finally, the consequences of utilizing these BCs (as opposed to directly initializing the self-similar solution in a computational spatial grid) are investigated in terms of common code verification analysis metrics (e.g., shock strength/position errors and global convergence rates).
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1352360
- Report Number(s):
- LA-UR-15-20171
- Journal Information:
- Journal of Verification, Validation and Uncertainty Quantification, Vol. 1, Issue 2; ISSN 2377-2158
- Publisher:
- ASMECopyright Statement
- Country of Publication:
- United States
- Language:
- English
A boundary condition for Guderley’s converging shock problem
|
journal | December 2019 |
Similar Records
Code Verification of the HIGRAD Computational Fluid Dynamics Solver
Fully implicit 1D radiation hydrodynamics: Validation and verification