Modelling Loss of Flow Transients in Gallium Thermal-hydraulic Facility Using Systems Code SAS4A/SASSYS-1 and Using CFD

2020 ◽  
Author(s):  
S. Namala ◽  
. Rizwan-uddin ◽  
T. Sumner
Keyword(s):  
Hydraulic Facility ◽  
Flow Transients

scholarly journals METHODS TO CALCULATE THE SOCIAL-ECONOMIC DAMAGE CAUSED BY FLOODS

2020 ◽  
pp. 5-11
Author(s):  
Givi Gavardashvili ◽  
◽  
Martin Vartanov ◽  
Keyword(s):  
Social Economic ◽  
Dam Failure ◽  
Economic Losses ◽  
Economic Damage ◽  
Earth Dams ◽  
Hydraulic Facility ◽  
Industrial Facilities ◽  
High Rise ◽  
Type Wave ◽  
The Social

The volumes of the water reservoirs flooded with high-rise hydrotechnical facilities, including high-rise earth dams, often range from several hundreds of millions to tens of billions of cubic meters and even more. The present paper describes the methodology to calculate the social-economic losses for the facilities flooded and destroyed by a tsunami-type wave in case of a possible high-rise hydraulic facility accident.The social-economic damage caused by a dam failure can be viewed as a sum of dam-age caused by human victim, destruction of hydraulic and industrial facilities and agricul-ture, pond economy, forestry and communal services.

Analysis of venous flow transients for estimation of vascular resistance, compliance, and blood flow distribution

1987 ◽  
Vol 65 (9) ◽  
pp. 1884-1890 ◽  
Author(s):  
Richard I. Ogilvie ◽  
Danuta Zborowska-Sluis
Keyword(s):  
Time Constant ◽  
Venous Return ◽  
Fast Time ◽  
Slow Time ◽  
Venous Outflow ◽  
Venous Flow ◽  
Time Constants ◽  
Slow Time Constant ◽  
Over Time ◽  
Flow Transients

We analysed venous flow transients using a long venous circuit and right heart bypass in 17 dogs after a rapid decrease in atrial pressure. A biphase curve was obtained which we decomposed into a two-compartmental model, one with a fast time constant for venous return (0.069 min) and 52% of total circulating flow [Formula: see text], and one with a slower time constant (0.456 min) and 48% of [Formula: see text]. Subsequently, separate drainage from splanchnic and peripheral beds (with the renal venous return in the peripheral bed drainage) allowed comparison of time constants and venous outflow in these beds. The sum of the venous outflow volumes over time during separate drainage was indistinguishable from the single biphasic venous outflow volume curve over time observed with a long circuit and single reservoir. The fast time constant of the biphasic curve was not different from that determined by separate drainage from the peripheral circulation. The slow time constant of the single biphasic curve of 0.456 min was hybrid of two time constants, 0.216 min in the splanchnic bed and 0.862 min in the peripheral bed. Separate drainage from peripheral and splanchnic vascular beds demonstrated that the peripheral bed constituted 70% of venous outflow in the fast time constant compartment using Caldini's technique, whereas the splanchnic bed constituted 63% of venous outflow in the slow time constant compartment. It is concluded that, although Caldini's technique demonstrates biphasic venous flow transients, neither the fast nor the slow time constant compartments resolved from this analysis represent a particular anatomical region or vascular bed.

Flood Prevention Strategy in Taiwan: Lessons Learned from Typhoon Morakot

2010 ◽  
Vol 5 (3) ◽  
pp. 325-329 ◽  
Author(s):  
Lung-Sheng Hsieh ◽  
◽  
Jiun-Huei Jang ◽  
Hsuan-Ju Lin ◽  
Pao-Shan Yu
Keyword(s):  
River Flow ◽  
Strong Field ◽  
River Basin Management ◽  
Field Investigation ◽  
Lessons Learned ◽  
Typhoon Morakot ◽  
Hydraulic Facility ◽  
Flood Prevention ◽  
System Failures ◽  
Climate Change Assessment

Typhoon Morakot hit Taiwan during August 7-9, 2009. Its record-breaking rainfall caused catastrophic damage, making it the deadliest typhoon to visit Taiwan in the last 50 years. Conducting a three-months and 160-member-strong field investigation of the scale and causes of this disaster, this paper proposes strategies effective to improve flood prevention work in Taiwan. The severe flood disaster triggered by Typhoon Morakot’s excessive rainfall is attributable to four factors: (1) hydraulic system failures, (2) river flow retardation, (3) reservoir release, and (4) land subsidence. Based on these findings, this paper proposes comprehensive improvement strategies in hydraulic facility inspection, emergency response, river basin management, and climate change assessment to improve flood prevention work in Taiwan. This study combines governmental, academic, and public efforts in investigating effective post-disaster flood prevention strategies that we hope will prove to be a useful reference for other countries while facing such issues.

Analysis of flow transients in a pipe with sparger and load reduction ring

2000 ◽  
Vol 27 (8) ◽  
pp. 1131-1142
Author(s):  
Yoon Y. Bae ◽  
Hwan-Yeol Kim ◽  
Jong-Kyun Park
Keyword(s):  
Load Reduction ◽  
Flow Transients
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