Numerical solution of turbulent flow problems in general geometry. [TEACH and TURF programs]

Conference · Thu Mar 01 04:00:00 EST 1979

OSTI ID:6292737

Wachspress, E L

Turbulent flow of fluid was computed satisfactorily with the Imperial College TEACH program for a wide spectrum of problems. TEACH geometry is restricted to rectangular grids in Cartesian or cylindrical coordinates. The TURF program being developed at KAPL uses the TEACH methodology with foursided isoparametric elements. This broadens modeling capabilities and enhances practical utilization of the TEACH method. It was discovered that a thorough understanding of TEACH numerics was essential for the desired geometry generalization. Crucial aspects of the analysis arise in study of the Navier--Stokes momentum and continuity equations without the complications associated with turbulence modeling common to TEACH and TURF. Among the devices in TEACH are direct computation of primitive variables, interlocking velocity and pressure grids, and derivation of pressure equations from integration over boxes of the continuity equation in which pressures do not appear explicitly. An iteration to consistency of velocities and pressures is superimposed on an iteration on the nonlinear part of the transport term. Linearized velocity and pressure equations are each solved iteratively. Each computation involves an intricate hierarchy of iterations that partially accounts for the limited supportive TEACH convergence analysis. It will be demonstrated that TEACH admits analysis similar to that used for neutron diffusion computation and that several heuristic schemes in TEACH can be motivated by this convergence analysis. Although this analytical basis is far from complete, it has been indispensable in the development of the TURF geometry generalization. 4 references.

• Research Organization: Knolls Atomic Power Lab., Schenectady, NY (USA)
• DOE Contract Number: EY-76-C-12-0052
• OSTI ID: 6292737
• Report Number(s): KAPL-4116; CONF-790620-1
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
640410 -- Fluid Physics-- General Fluid Dynamics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPUTER CODES
COMPUTER SIMULATION
CONFIGURATION
COORDINATES
CYLINDRICAL CONFIGURATION
FLUID FLOW
GEOMETRY
ITERATIVE METHODS
LINEAR MOMENTUM
MATHEMATICS
NONLINEAR PROBLEMS
PRESSURE DEPENDENCE
SERIES EXPANSION
SIMULATION
T CODES
TRANSPORT THEORY
TURBULENT FLOW
VELOCITY