Improving convergence rates for low pressure material processing calculations
An enhanced solution strategy for the SIMPLER algorithm is presented for low pressure heat and mass transport calculations with applications in material processing. The accurate solution of highly diffusive flows requires an inflow boundary condition that preserves chemical species mass fluxes. The flux-preserving inflow boundary condition contains a scaling problem that causes the species equations to converge very slowly when using the standard SIMPLER algorithm. A gradient algorithm, coupled to a line-relaxation method, accelerates the convergence of the linear problem. Reformulation of the pressure-correction boundary conditions ensures that continuity is preserved in each finite volume at each iteration. The boundary condition scaling problem is demonstrated with a simple linear model problem. The enhanced solution strategy is implemented in a baseline computer code that is used to solve the multicomponent Navier-Stokes equations on a generalized, multiple-block grid system. Convergence rate acceleration factors of up to 100 are demonstrated for several material processing example problems.
- Research Organization:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 453906
- Report Number(s):
- SAND-96-8559C; CONF-960738-9; ON: DE97050448
- Resource Relation:
- Conference: 1996 American Society of Mechanical Engineers (ASME) Fluid Engineering Division summer meeting, San Diego, CA (United States), 7-11 Jul 1996; Other Information: PBD: [1996]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
36 MATERIALS SCIENCE
HEAT TRANSFER
ALGORITHMS
MASS TRANSFER
MANUFACTURING
COMPUTERIZED SIMULATION
MATERIALS
SCALING
DIFFUSION
CONVECTION
S CODES
BOUNDARY CONDITIONS
PROCESS CONTROL
CALCULATION METHODS
NAVIER-STOKES EQUATIONS
NUMERICAL ANALYSIS