-The KORSAR/CFD code results from the development of the KORSAR/GP system code certified in 2009 by the Rostekhnadzor (Federal Service for Ecological, Technological, and Nuclear Supervision) as applied to the calculat...
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-The KORSAR/CFD code results from the development of the KORSAR/GP system code certified in 2009 by the Rostekhnadzor (Federal Service for Ecological, Technological, and Nuclear Supervision) as applied to the calculated justification of the safety for VVER reactors. One of the important aspects of development consists in the introduction of the CFD-module code into functional content for the simulation of spatial turbulent flows in the mixing chambers of reactors using a nested boundary method in the RANS-approximation. The CFD module is combined with a one-dimensional model according to a semi-implicit scheme as a standard code element. Calculation results using the KORSAR/CFD code are presented for the following three modes with the asymmetrical operation of a VVER-1000 reactor's flow-circuit loops. They consist in breaking the steam pipeline in the steam generator, in connecting the main circulation pump while initially operating three pumps at the reactor power of 71% with respect to the nominal one, and in connecting a pump while initially operating two opposite pumps at the reactor power of 52% with respect to the nominal one. The calculations have been carried out based on the input data file for the NPP power unit with a VVER-1000 developed by the specialists in VVER design at OKB Gidropress, the Chief Designer in the field of VVER reactor units. A three-dimensional simulation of coupled neutron-physical and thermohydraulic processes in the reactor core has been performed. A thermohydraulic model of the reactor core has been used in a channel-by-channel approximation and a program block for the calculation of three-dimensional neutron kinetics. In the problems under consideration, the three-dimensional simulation domain for the CFD module includes four inlet manifolds and a part of the reactor pressure chamber before entering the holes in the elliptical bottom of the shaft. The holes in the elliptical bottom and the area beyond the shaft up to the outlet man
This paper deals with the formulation and programing of architecture of software component generated by Reluctool. This software tool allows the modeling of large reluctance networks of electrical machines. Portable m...
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This paper deals with the formulation and programing of architecture of software component generated by Reluctool. This software tool allows the modeling of large reluctance networks of electrical machines. Portable model formulation and code architectures are introduced facing the model generation time, the model size, and the computation time. Different approaches are discussed to improve this aspect. Finally, the code architecture is compared with the actual code architecture of the commercial and previous version of Reluctool.
In the Trispal CCL accelerating cavities, the coupling slots between contiguous cells had been optimized with MAFIA, in a way to maximize the shunt impedance. The result was a set of "4-petal" slots that wer...
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In the Trispal CCL accelerating cavities, the coupling slots between contiguous cells had been optimized with MAFIA, in a way to maximize the shunt impedance. The result was a set of "4-petal" slots that were supposed to yield almost no shunt impedance drop, compared to a single cell cavity [P. Balleyguier, Linac conf. Geneva, 1996, p. 414]. In order to check this out, a cold model has been constructed. The goal was to accurately measure the Q-drop caused by coupling slots, and to compare it to predicted values. We achieved a good experimental precision on the Q-drop, and we can state that the predictions were definitely wrong: the actual Q-drop is ( - 22.5 +/- 0.5) %, about four times more than simulated. We conclude that the "4-petal" slots should be abandoned, and that 3D-code estimations of local power loss may be very inaccurate in some cases. (C) 1998 Elsevier Science B.V. All rights reserved.
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