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| 1 | An improved semi-implicit direct kinetics method for transient analysis of nuclear reactors显示文摘Semi-implicit direct kinetics(SIDK)is an innovative method for the temporal discretization of neutronic equations proposed by J.Banfield.The key approximation of the SIDK method is to substitute a timeaveraged quantity for the fission source term in the delayed neutron differential equations.Hence,these equations are decoupled from prompt neutron equations and an explicit analytical representation of precursor groups is obtained,which leads to a significant reduction in computational cost.As the fission source is not known in a time step,the original study suggested using a constant quantity pertaining to the previous time step for this purpose,and a reduction in the size of the time step was proposed to lessen the imposed errors.However,this remedy notably diminishes the main advantage of the SIDK method.We discerned that if the original method is properly introduced into the algorithm of the point-implicit solver along with some modifications,the mentioned drawbacks will be mitigated adequately.To test this idea,a novel multigroup,multi-dimensional diffusion code using the finitevolume method and a point-implicit solver is developed which works in both transient and steady states.In addition to the SIDK,two other kinetic methods,i.e.,direct kinetics and higher-order backward discretization,are programmed into the diffusion code for comparison with the proposed model.The final code is tested at different conditions of two well-known transient benchmark problems.Results indicate that while the accuracy of the improved SIDK is closely comparable with the best available kinetic methods,it reduces the total time required for computation by up to 24%. | Roozbeh Vadi Kamran Sepanloo | 2019 | Nuclear Science and Techniques2019，30，11： | 3 |
| 2 | Slowing Production Deline and Extending the Economic Life of an Oil Field:New MEOR Technology 显示文摘 | Brown L R Vadie A A Stephens J O | | SPE0，，： | 2 |
| 3 | How does Culture Contribute to Innovation?Evidence from European Countries显示文摘 | Kaasa A Vadi M | 2010 | Economics of Innovation and New Technology2010，19，7： | 1 |
| 4 | Organizational Values and Organizational Practice: What Makes Them Diverge? 显示文摘 | JAAKSON K REINO A VADI M | 2008 | EBS Review2008，25，9： | 1 |
| 5 | How does culture contribute to inno- vation? Evidence from European countries显示文摘 | Kaasa A Vadi M | 2010 | Econom- ics of Innovation and New Technology2010，19，7： | 1 |
| 6 | Synthesis,structure and properties of novel polyls from cardanol and developed polyurethanes显示文摘 | Kattimuttathu I Suresh Vadi S Kishanprasad | | 0，，13： | 1 |
| 7 | 9 显示文摘 | Benbasat I Barki H Quo Vadis TAM | 2007 | Journal of AIS2007，8，4： | 1 |
| 8 | Management techniques in estonian organizations: learning organization and busi- ness process reengineering 显示文摘 | Alas R Vilson M Z Vadi M | 2012 | Procedia - Social and Behavioral Sciences2012，64，24： | 1 |
| 9 | Slowing production decline and extending the economic life of an oil field:New MEOR technology显示文摘 | Brown L R Vadie A A Stephens J O | 2000 | SPE 59 3062000，，： | 1 |
| 10 | Collateral blood flow? A commentary on a highly cited paper显示文摘 | Schaper W Vadis Q | 2000 | Cardiovasc Res2000，45，： | 1 |
| 11 | Environmental impact assessment in investment disputes : Method, governance and jurisprudence显示文摘 | Vadi V | 2010 | Polish Year- book of International Law2010，30，： | 1 |
| 12 | Use of contrast before percutaneous neurolytic block显示文摘 | Goroszeniuk T di Vadi P | 2000 | Reg Anesth Pain Med2000，25，4： | 1 |
| 13 | Anaesthetic management of the child with co-existing pulmonary disease 显示文摘 | Lauer R Vadi M Mason L | 2012 | Br J Anaesth2012，1091，： | 1 |
| 14 | Experimental evaluation of a uniform transmembrane pressure crossflow microfiltration unit for the concentration of micellar casein from skim milk 显示文摘 | VADI P RIZVI S | 2001 | Journal of Membrane Science2001，189，： | 1 |
| 15 | Unsteady airflows in rapid transit systems : Part 2 : Theoretical background and design paramenters 显示文摘 | VADY A E | 1980 | Proc Instn Mech Engrs1980，19，4： | 1 |
| 16 | A MPEG2-transparent scrambling technology显示文摘 | Melih P Vadi D | 2002 | IEEE Transactions on Consumer Electronics2002，48，2： | 1 |
| 17 | Application of the Freundlich, Langmuir, Temkin and Harins-Jura Adsorption Isotherms for Some Amino Acids and Amino Acids Complexation with Manganese Ion(II) on Carbon Nanotube显示文摘 | MEHDI VADI MARJAN ABBASI MARJAN ZAKERI | 2011 | International Conference on Nanotechnolo' and Biosensors2011，，2： | 1 |
| 18 | An improved porous media model for nuclear reactor analysis显示文摘In this study, two modifications are proposed to mitigate drawbacks of the conventional approach of using the ‘‘Porous Media Model''(PMM) for nuclear reactor analysis. In the conventional approach, whole reactor core simplifies to a single porous medium and also, the resistance coefficients that are essential to using this model are constant values. These conditions impose significant errors and restrict the applications of the model for many cases,including accident analysis. In this article, the procedures for calculating the coefficients are modified by introducing a practical algorithm. Using this algorithm will result in obtaining each coefficient as a function of mass flow rate.Furthermore, the method of applying these coefficients to the reactor core is modified by dividing the core into several porous media instead of one. In this method, each porous medium comprises a single fuel assembly. PMM with these two modifications is termed ‘‘multi-region PMM'' in this study. Then, the multi-region PMM is introduced to a new CFD-based thermo-hydraulic code that is specifically devised for combining with neutronic codes.The CITVAP code, which solves multi-group diffusion equations, is the selected as the neutronic part for this study. The resulting coupled code is used for simulation of natural circulation in a MTR. A new semi-analytic method,based on steady-state CFD analysis is developed to verify the results of this case. Results demonstrate considerable improvement, compared to the conventional approach. | Roozbeh Vadi Kamran Sepanloo | 2016 | Nuclear Science and Techniques2016，27，1： | 0 |
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