TY - GEN
T1 - K-E modeling using modified nodal integral method
AU - Singh, Suneet
AU - Uddin, Rizwan
PY - 2008
Y1 - 2008
N2 - The simulation of turbulent flows is an ongoing challenge. This is especially true for the flows in nuclear reactors. In order to save computational time and resource, accurate numerical schemes are required for such simulations. The encouraging results from the laminar flow simulations using Mod(fied Nodal Integral Method (MNIM), serves as a motivation to use the method for turbulent flow simulations. The k-c model in this work has been implemented using the MNIM formulation. Two models, one for low Reynolds number and one for high Reynolds number; are implemented. The application of the model to relatively simple problems shows that results are good and similar to what one would expect from the k- c model implementation with any other numerical scheme. The results are compared with the DNS data from various sources in the literature. The difference between the DNS data and current implementation arises mainly from the assumption made in the k- c model rather than the choice of the numerical scheme in the present work. It is seen that very coarse grids can be used away from the walls for the present simulation. This is especially true for low Reynolds number model. However; away from the wall very few cells are needed. Hence, MIVIM formulation for the k-e model promises to reduce the over all computational cost despite the fact that there will be relatively little gain in regions near the walls.
AB - The simulation of turbulent flows is an ongoing challenge. This is especially true for the flows in nuclear reactors. In order to save computational time and resource, accurate numerical schemes are required for such simulations. The encouraging results from the laminar flow simulations using Mod(fied Nodal Integral Method (MNIM), serves as a motivation to use the method for turbulent flow simulations. The k-c model in this work has been implemented using the MNIM formulation. Two models, one for low Reynolds number and one for high Reynolds number; are implemented. The application of the model to relatively simple problems shows that results are good and similar to what one would expect from the k- c model implementation with any other numerical scheme. The results are compared with the DNS data from various sources in the literature. The difference between the DNS data and current implementation arises mainly from the assumption made in the k- c model rather than the choice of the numerical scheme in the present work. It is seen that very coarse grids can be used away from the walls for the present simulation. This is especially true for low Reynolds number model. However; away from the wall very few cells are needed. Hence, MIVIM formulation for the k-e model promises to reduce the over all computational cost despite the fact that there will be relatively little gain in regions near the walls.
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M3 - Conference contribution
AN - SCOPUS:70349858101
SN - 9781605607870
T3 - International Conference on Advances in Nuclear Power Plants, ICAPP 2008
SP - 1832
EP - 1842
BT - American Nuclear Society - International Conference on Advances in Nuclear Power Plants, ICAPP 2008
T2 - International Conference on Advances in Nuclear Power Plants, ICAPP 2008
Y2 - 8 June 2008 through 12 June 2008
ER -