LOCAL ZOOM COMPUTATION OF TWO-PHASE FLOWS IN STEAM GENERATORS USING A LOCAL DEFECT CORRECTION METHOD

A local defect method used to perform local zoom computations within the framework of the steady-state two-phase flow simulations of pressurized water reactor (PWR) steam generators is described. The particular local defect correction (LDC) formulation used, jointly with the finite-element method (F...

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Vydáno v:Numerical heat transfer. Part A, Applications Ročník 43; číslo 2; s. 111 - 135
Hlavní autoři: Belliard, M., Grandotto, M.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Informa UK Ltd 01.02.2003
Taylor & Francis
Témata:
Engineering Sciences
Fluid mechanics
Fluids mechanics
Mechanics
Physics
ISSN:1040-7782, 1521-0634
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Shrnutí:A local defect method used to perform local zoom computations within the framework of the steady-state two-phase flow simulations of pressurized water reactor (PWR) steam generators is described. The particular local defect correction (LDC) formulation used, jointly with the finite-element method (FEM), a projection algorithm, and the Crank-Nicholson scheme for nonlinear averaged mixture balance equations, is discussed, as well as the particular geometry involved (3-D local hierarchical multigrid). In the case of vortices located at an inner interface, the boundary conditions are dynamically managed in an approach "à la adaptive Dirichlet Neumann." Cluster workstations, using a master-slaves context (through a code linker) and the PVM package, are used. Results concerning the simulation of a mock-up are provided. The parallel and sequential LDC computation results are compared with the results of classical full-domain computations. The conclusion describes the improvements in the accuracy of the corrected region and on the coherence between the zoom and the full domain.
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ISSN:1040-7782
1521-0634
DOI:10.1080/10407780307329