scholarly journals Two dimensional local adaptive discrete velocity grids for rarefied flow simulations

2016 ◽  
Author(s):  
S. Brull ◽  
L. Forestier-Coste ◽  
L. Mieussens
Keyword(s):  
Two Dimensional ◽  
Rarefied Flow ◽  
Discrete Velocity ◽  
Flow Simulations

scholarly journals Locally refined discrete velocity grids for stationary rarefied flow simulations

2014 ◽  
Vol 257 ◽  
pp. 572-593 ◽  
Author(s):  
C. Baranger ◽  
J. Claudel ◽  
N. Hérouard ◽  
L. Mieussens
Keyword(s):  
Rarefied Flow ◽  
Discrete Velocity ◽  
Flow Simulations

Locally refined discrete velocity grids for deterministic rarefied flow simulations

2012 ◽  
Author(s):  
C. Baranger ◽  
J. Claudel ◽  
N. Hérouard ◽  
L. Mieussens
Keyword(s):  
Rarefied Flow ◽  
Discrete Velocity ◽  
Flow Simulations

LMFBR Loss of Flow Simulations in the Sodium Loop Safety Facility

1981 ◽  
Vol 103 (4) ◽  
pp. 605-611
Author(s):  
W. A. Ragland
Keyword(s):  
Single Channel ◽  
Two Dimensional ◽  
Flow Simulations ◽  
Early Stages ◽  
Dimensional Effects ◽  
Sequence Of Events ◽  
Post Test

A series of three LMFBR unprotected loss of flow (LOF) accidents has been simulated in the Sodium Loop Safety Facility (SLSF). The results of these in-reactor experiments verify that the dynamics of sodium voiding are, in general, well represented by current single channel slug expulsion models. Some refinement in the models in the very early stages of voiding would be desirable to account for minor two dimensional effects. However, cladding motion is not as well understood and current modeling does not accurately predict all of the aspects of blockage formation. Two of the three experiments produced partial rather than complete upper blockages as had been predicted. Predictions of time of fuel melting appear relatively accurate. In general, the sequence of events is correctly predicted and the timing of these events is relatively accurate. Reactivity measurements and post-test examinations indicate that no significant fuel compaction occurred. This behavior would prevent an energetic recriticality in an LOF accident.

scholarly journals Flow modeling and analysis of compound channel in river network with complex floodplains and groynes

2010 ◽  
Vol 13 (3) ◽  
pp. 474-488 ◽  
Author(s):  
Hassan Ahmed ◽  
Norio Tanaka ◽  
Nobuyuki Tamai
Keyword(s):  
Water Depth ◽  
River Flow ◽  
Storage Capacity ◽  
Flow Simulation ◽  
Two Dimensional ◽  
Compound Channel ◽  
Modeling And Analysis ◽  
Flow Models ◽  
Flow Simulations ◽  
Kanto Region

Presented here are flow simulations of a network of natural rivers flanked by one or two large and complex floodplains with impermeable groynes and bridge embankments using one- and quasi-two-dimensional dynamic flow models. The effects of the large floodplain storage capacity, momentum transfer interaction and apparent shear stress at the vertical interface between the main channel and floodplain on the flow-simulated discharge and water depth values could be well explained. The two models were tested and validated in the Arakawa River basin, Kanto Region, Japan. The simulated results show that the large floodplain storage capacity greatly affected the flow discharge and water depth results and cannot be neglected. The quasi-two-dimensional river flow model was used in a flow simulation of a compound channel with complex floodplains with groynes and gave more acceptable results. In the simulated case, the average reduction in flood discharge using floodplain groynes was about 7–15%. Thus, floodplain groynes can be effective for flood protection and attenuation.

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