High-Fidelity Numerical Modeling of Compressible Flow

2015 ◽  
Author(s):  
Nicholas J. Bisek
Keyword(s):  
Numerical Modeling ◽  
Compressible Flow ◽  
High Fidelity

Doppler echo evaluation of pulmonary venous-left atrial pressure gradients: human and numerical model studies

2000 ◽  
Vol 279 (2) ◽  
pp. H594-H600 ◽  
Author(s):  
Michael S. Firstenberg ◽  
Neil L. Greenberg ◽  
Nicholas G. Smedira ◽  
David L. Prior ◽  
Gregory M. Scalia ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Left Atrial ◽  
Atrial Pressure ◽  
Left Atrial Pressure ◽  
High Fidelity ◽  
Pressure Gradients ◽  
Bernoulli Equation ◽  
Venous Flow ◽  
Model Studies ◽  
Pulmonary Venous Flow

The simplified Bernoulli equation relates fluid convective energy derived from flow velocities to a pressure gradient and is commonly used in clinical echocardiography to determine pressure differences across stenotic orifices. Its application to pulmonary venous flow has not been described in humans. Twelve patients undergoing cardiac surgery had simultaneous high-fidelity pulmonary venous and left atrial pressure measurements and pulmonary venous pulsed Doppler echocardiography performed. Convective gradients for the systolic (S), diastolic (D), and atrial reversal (AR) phases of pulmonary venous flow were determined using the simplified Bernoulli equation and correlated with measured actual pressure differences. A linear relationship was observed between the convective ( y) and actual ( x) pressure differences for the S ( y = 0.23 x + 0.0074, r = 0.82) and D ( y = 0.22 x + 0.092, r = 0.81) waves, but not for the AR wave ( y = 0.030 x + 0.13, r = 0.10). Numerical modeling resulted in similar slopes for the S ( y = 0.200 x − 0.127, r = 0.97), D ( y = 0.247 x − 0.354, r= 0.99), and AR ( y = 0.087 x − 0.083, r = 0.96) waves. Consistent with numerical modeling, the convective term strongly correlates with but significantly underestimates actual gradient because of large inertial forces.

High-Fidelity Numerical Modeling of Spark Plug Erosion

2019 ◽  
Author(s):  
Douglas Breden ◽  
Anand Karpatne ◽  
Kenta Suzuki ◽  
Laxminarayan Raja
Keyword(s):  
Numerical Modeling ◽  
High Fidelity ◽  
Spark Plug

High-fidelity numerical modeling of the Upper Mississippi River under extreme flood condition

2016 ◽  
Vol 98 ◽  
pp. 97-113 ◽  
Author(s):  
Ali Khosronejad ◽  
Trung Le ◽  
Petra DeWall ◽  
Nicole Bartelt ◽  
Solomon Woldeamlak ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Mississippi River ◽  
High Fidelity ◽  
Upper Mississippi River ◽  
Extreme Flood ◽  
Flood Condition
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