Large eddy simulation on supercomputers

Technical Report · Thu Nov 01 04:00:00 EST 1990

OSTI ID:6493324

Hassan, Y A; Bagwell, T G ^[1]

---

1. Texas A and M Univ., College Station, TX (USA). Dept. of Nuclear Engineering

The GUST computer program for Large Eddy Simulation is implemented on supercomputer machines. This work is a continuation of work started by the Electric Power Research Institute (EPRI). GUST is a computer program for incompressible, isothermal flow turbulence in complex, three-dimensional geometries. Gust solves the unsteady, space-averaged, Navier-Stokes equations. The turbulent velocity profiles in two steam generator regions have been calculated using the Gust Large Eddy Simulations program and compared to experimental findings. LES presumes that only the large scale components of the velocity must be explicitly calculated, while the small scale eddies can be modeled effectively. In this study, the sub-grid-scale turbulence has been modeled with the Smagorinsky model, a turbulent subgrid viscosity approximation. The two regions simulated are the waterbox of a Westinghouse model D-4 stem generator and a deep tube bundle region consistent with the Westinghouse model 51 steam generator. Both have been compared to experimental finding. The waterbox region was simulated using two finite difference nodalizations; the first with 8100 cells and the second with 51422 cells. The power spectrum and Lagrangian autocorrelation for several locations at the exit of the waterbox were calculated. The two nodalizations are in reasonable agreement with each other and with the experimental findings previously conducted by the Electrical Power Research Institute. The deep tube bundle region was simulated with 1536 computational cells. The spectrum of the fluctuating lift and drag coefficients were calculated and compared to experimental findings from Argonne National Laboratory. The calculation predicts several features that were exhibited in the experiment. The results, as compared to experiment, show that LES is capable of calculating the spectrum.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (USA); Texas A and M Univ., College Station, TX (USA). Dept. of Nuclear Engineering
• Sponsoring Organization: EPRI
• OSTI ID: 6493324
• Report Number(s): EPRI-NP-7041
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210200* -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220200 -- Nuclear Reactor Technology-- Components & Accessories
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
640410 -- Fluid Physics-- General Fluid Dynamics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
BOILERS
COMPUTER CODES
COMPUTERIZED SIMULATION
COMPUTERS
CRAY COMPUTERS
CURRENTS
DIFFERENTIAL EQUATIONS
DIGITAL COMPUTERS
EDDY CURRENTS
ELECTRIC CURRENTS
EQUATIONS
FLUID FLOW
G CODES
HEAT EXCHANGERS
MECHANICAL VIBRATIONS
NAVIER-STOKES EQUATIONS
NUMERICAL SOLUTION
PARTIAL DIFFERENTIAL EQUATIONS
PRESSURE TUBES
SIMULATION
STEAM GENERATORS
SUPERCOMPUTERS
TUBES
TURBULENT FLOW
VAPOR GENERATORS