RHALE: A MMALE shock physics code written in C++
This paper describes RHALE, a multi-material arbitrary Lagrangian-Eulerian (MMALE) shock physics code. RHALE is the successor to CTH, Sandia's 3-D Eulerian shock physics code, and will be capable of solving problems that CTH cannot adequately address. We discuss the new Lagrangian capabilities of HALE, which include arbitrary mesh connectivity, superior artificial viscosity, and improved equations of state. We also discuss some of the issues we have encountered in the choice of an axisymmetric element technology and our resolution of these issues. We discuss the MALE algorithms that have been extended for arbitrary grids in both two and three dimensions and present the results of calculations that are of interest to the hypervelocity impact community. The MALE addition to HALE provides the accuracy of a Lagrangian code while allowing a calculation to proceed under very large distortions. Coupling an arbitrary quadrilateral or hexahedral grid to the MALE solution facilitates modeling of complex shapes with a minimum number of computational cells. HALE allows regions of a problem to be modeled with Lagrangian, Eulerian or ALE meshes. In addition, regions can switch from Lagrangian to ALE to Eulerian based on user input or mesh distortion. For ALE meshes, new node locations are determined with equipotential schemes. Element quantities are advected with donor, van Leer, or Super-B algorithms. Nodal quantities are advected with the second order SHALE or HIS algorithms. To facilitate the development of such a lengthy code, we choose to write in the C++ programming language. We feel that object-oriented programming techniques are superior to conventional programming techniques. However, we discuss a few of the efficiency problems we have encountered using these techniques and how we have addressed these problems.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7081530
- Report Number(s):
- SAND-91-2907C; CONF-921162-5; ON: DE92018271
- Resource Relation:
- Conference: Hypervelocity impact symposium, Austin, TX (United States), 17-20 Nov 1992
- Country of Publication:
- United States
- Language:
- English
Similar Records
RHALE: A 3-D MMALE code for unstructured grids
RHALE: A MMALE shock physics code for arbitrary meshes
Related Subjects
42 ENGINEERING
SHOCK WAVES
R CODES
ADVECTION
ALGORITHMS
COMPUTERIZED SIMULATION
DEFORMATION
EQUATIONS OF MOTION
IMPACT SHOCK
MESH GENERATION
PROGRAMMING LANGUAGES
COMPUTER CODES
DIFFERENTIAL EQUATIONS
EQUATIONS
MASS TRANSFER
MATHEMATICAL LOGIC
PARTIAL DIFFERENTIAL EQUATIONS
SIMULATION
990200* - Mathematics & Computers
420200 - Engineering- Facilities
Equipment
& Techniques