ICONE11-36545 Using the RELAP5-3D^[○!C]Advanced Systems Analysis Code with Commercial and Advanced CFD Software

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概要

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• Fluent and RELAP5-3D^[○!C]/ATHENA are coupled using a technique that permits implicit inter-actions between them using an Executive Program (Weaver, Tomlinson, & Aumiller, 2002). Hence, if necessary, the Executive will allow Fluent and RELAP5-3D^[○!C]/ATHENA to move forward in calculation space on a time-step-by-time step basis. In addition, the point to three-dimension neutronics/reactor kinetics subroutine in RELAP5-3D^[○!C]/ATHENA (based on NESTLE) can be used, by itself, together with Fluent so a three-dimensional fluids model can be coupled with a three-dimensional neutronics model while the balance of the RELAP5-3D^[○!C]/ATHENA subroutines are used to model the system piping and other system components. Fluent and RELAP5-3D[○!C]/ATHENA were linked using an Executive Program (see Figure 1) that (a) monitors the calculational progression in each code, (b) determines when each code has converged, (c) governs the information interchanges between the codes, and (d) issues permission to allow each code to progress to the next time step. The Executive Program was interfaced with Fluent and RELAP5-3D^[○!C]/ATHENA using user-defined functions. User-defined functions were also used to ensure the fluid properties used by Fluent and RELAP5-3D^[○!C]/ATHENA are equivalent. The Executive Program uses the Parallel Virtual Machine (PVM) as the control medium. The Executive Program interacts with Fluent and RELAP5-3D^[○!C]/ATHENA and governs the interactions between Fluent and RELAP5-3D^[○!C]/ATHENA since the two codes are each independent domains. As noted in Weaver, Tomlinson, and Aumiller, 2001^* : "..volume 1 is adjacent to and connected to volume I, and volume 2 is adjacent to and connected to volume II. The boundary volumes in one of the domains (i.e., 1 and 2) represent normal volumes in the interior of the other computational domain (i.e., I and II). Information about these volumes must be passed between the domains at the coupling boundary to achieve an integrated solution." Using the above approach, the domains can be coupled explicitly or semi-implicitly depending on the problem type.

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著者

• Schultz Richard

  Idaho National Engineering & Environmental Laboratory

• Schultz Richard

  Idaho National Engineering & Environmental Laboratory

• Weaver Walter

  Idaho National Engineering & Environmental Laboratory

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• ICONE11-36545 Using the RELAP5-3D^[○!C]Advanced Systems Analysis Code with Commercial and Advanced CFD Software

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