Numerical simulations of high frequency transverse pulsed jet injection into a supersonic crossflow

2020 ◽  
Vol 103 ◽  
pp. 105908 ◽  
Author(s):  
Nehemiah J. Williams ◽  
Trevor M. Moeller ◽  
Richard J. Thompson
Keyword(s):  
Numerical Simulations ◽  
High Frequency ◽  
Jet Injection ◽  
Pulsed Jet

scholarly journals Determining breast pathology in surgical margins with high-frequency ultrasound: phantom and numerical simulations

2013 ◽  
Author(s):  
Timothy E. Doyle ◽  
Monica Cervantes ◽  
Laurel A. Thompson ◽  
Joseph E. Roring ◽  
Matthew A. Grover ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
High Frequency ◽  
Surgical Margins ◽  
High Frequency Ultrasound ◽  
Breast Pathology ◽  
Ultrasound Phantom ◽  
Frequency Ultrasound

scholarly journals Secular evolution in galaxies

2006 ◽  
Vol 2 (S235) ◽  
pp. 19-23 ◽  
Author(s):  
F. Combes
Keyword(s):  
Star Formation ◽  
Numerical Simulations ◽  
Significant Role ◽  
High Frequency ◽  
Central Star ◽  
Barred Galaxies ◽  
Secular Evolution ◽  
Gas Accretion ◽  
Bar Formation

AbstractNew observations in favour of a significant role of secular evolution are reviewed: central star formation boosted in pseudo-bulge barred galaxies, relations between bulge and disk, evidence for rejuvenated bulges. Numerical simulations have shown that secular evolution can occur through a cycle of bar formation and destruction, in which the gas plays a major role. Since bars are weakened or destroyed in gaseous disks, the high frequency of bars observed today requires external cold gas accretion, to replenish the disk and allow a new bar formation. The rate of gas accretion from external filaments is compatible with what is observed in cosmological simulations.

A New High-Performance Adaptive Engine Mount

2004 ◽  
Vol 10 (1) ◽  
pp. 39-54 ◽  
Author(s):  
Mahmoud S Foumani ◽  
A. Khajepour ◽  
Mohammad Durali
Keyword(s):  
Sensitivity Analysis ◽  
Numerical Simulations ◽  
High Frequency ◽  
High Performance ◽  
Low Frequency ◽  
Engine Mount

In this paper, we introduce a new high-performance adaptive hydraulic engine mount. The mount is tuned to road and engine conditions by changing the length of the inertia track and effective decoupler area in low-frequency road and high-frequency engine excitations. A single actuator is used to tune the mount in both low-frequency and high-frequency regimes. Sensitivity analysis is used to show that changing the length of the inertia track and decoupler area is the most effective way to tune an adaptive mount. Numerical simulations indicate that the proposed design can significantly improve the performance of a passive hydraulic mount.

scholarly journals Measurement of the transient shielding effectiveness of shielding cabinets

2008 ◽  
Vol 6 ◽  
pp. 293-298 ◽  
Author(s):  
H. Herlemann ◽  
M. Koch
Keyword(s):  
Numerical Simulations ◽  
Electromagnetic Fields ◽  
High Frequency ◽  
Comsol Multiphysics ◽  
Magnetic Shielding ◽  
Shielding Effectiveness ◽  
Transient Electromagnetic ◽  
Electric And Magnetic Fields ◽  
Numerical Tools ◽  
Gtem Cell

Abstract. Recently, new definitions of shielding effectiveness (SE) for high-frequency and transient electromagnetic fields were introduced by Klinkenbusch (2005). Analytical results were shown for closed as well as for non closed cylindrical shields. In the present work, the shielding performance of different shielding cabinets is investigated by means of numerical simulations and measurements inside a fully anechoic chamber and a GTEM-cell. For the GTEM-cell-measurements, a downscaled model of the shielding cabinet is used. For the simulations, the numerical tools CONCEPT II and COMSOL MULTIPHYSICS were available. The numerical results agree well with the measurements. They can be used to interpret the behaviour of the shielding effectiveness of enclosures as function of frequency. From the measurement of the electric and magnetic fields with and without the enclosure in place, the electric and magnetic shielding effectiveness as well as the transient shielding effectiveness of the enclosure are calculated. The transient SE of four different shielding cabinets is determined and discussed.

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