New results on gas density, velocity field, and force field of a gasdynamic laser within a supersonic nozzle

2010 ◽  
Vol 374 (24) ◽  
pp. 2464-2466
Author(s):  
M.A. Grado-Caffaro ◽  
M. Grado-Caffaro
Keyword(s):  
Velocity Field ◽  
Force Field ◽  
Supersonic Nozzle ◽  
Gasdynamic Laser ◽  
Gas Density

Characteristics of Combustion-Driven CO2 Gasdynamic Laser. (II). Effect of Expansion Length of Supersonic Nozzle.

2000 ◽  
Vol 48 (559) ◽  
pp. 257-264
Author(s):  
Tadaharu WATANUKI ◽  
Eiji OGURA ◽  
Yasuhiro MIZOBUCHI ◽  
Satoru MOMO ◽  
Hirotoshi KUBOT
Keyword(s):  
Supersonic Nozzle ◽  
Gasdynamic Laser

scholarly journals Characteristics of combustion-driven CO2 gasdynamic laser. (I). Influence of expansion ratio of a supersonic nozzle.

1988 ◽  
Vol 36 (419) ◽  
pp. 550-557
Author(s):  
Tadaharu WATANUKI ◽  
Eiji OGURA ◽  
Yasuhiro MIZOBUCHI ◽  
Shigeru SATO ◽  
Hirotoshi KUBOTA
Keyword(s):  
Supersonic Nozzle ◽  
Expansion Ratio ◽  
Gasdynamic Laser

scholarly journals Estimating the moments of a random forcing field of 2D fluid from image sequences using energy minimisation method

2021 ◽  
Author(s):  
Vishal Kumar Pandey ◽  
Jyotsna Singh ◽  
Harish Parthasarathy
Keyword(s):  
Velocity Field ◽  
Force Field ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Moment Matching ◽  
Velocity Measurements ◽  
Navier Stokes Equations ◽  
Random Forcing ◽  
Energy Minimisation ◽  
Field Estimation

AbstractIn this paper, we consider a version of energy minimisation technique applied to images of a 2D fluid flow. The two Navier–Stokes equations describe the static flow of a 2D fluid in terms of velocity field, (u, v), pressure field, p and forcing field, f. Apart from these two Navier–Stokes equations, we have the incompressibility condition to evaluate the three parameters. While implementing this system, random noise (usually non-Gaussian) creeps into the random force field $$\underline{f}(x,y)$$ f ̲ ( x , y ) . We denote this random field by $$\delta \underline{f}(x,y)$$ δ f ̲ ( x , y ) having zero mean and non-trivial second and third moments. We assume that these two moments are known except for some unknown parameters $$\underline{\theta }$$ θ ̲ (like mean, variance, co-variance, skewness, etc.) which we wish to estimate. In the proposed technique, we first calculate the approximate shift in the average fluid energy defined as a quadratic function of the velocity field. The energy method then requires that $$\underline{\theta }$$ θ ̲ should be such that this average increases in the energy due to the random forcing component be minimised. We should, however, note that the standard statistical approach to force field estimation is to calculate the velocity field as a function of the force field and then adopt the statistical moment matching technique. Such an approach assumes spatial ergodicity of the velocity field. This approach to force field estimation is more accurate from the statistical moment matching view point but works only if velocity measurements are made. The former technique of energy minimisation does not require any velocity measurements. Both of these techniques are discussed in this paper and MATLAB simulations presented.

DEPENDENCE OF THE TURBULENT VELOCITY FIELD ON GAS DENSITY IN L1551

2010 ◽  
Vol 718 (2) ◽  
pp. 1019-1035 ◽  
Author(s):  
Atsushi Yoshida ◽  
Yoshimi Kitamura ◽  
Yoshito Shimajiri ◽  
Ryohei Kawabe
Keyword(s):  
Velocity Field ◽  
Turbulent Velocity ◽  
Gas Density ◽  
Turbulent Velocity Field

FEA of Flow Fluid of Six-Wing Synchronous Varying Clearance Rotor

2013 ◽  
Vol 561 ◽  
pp. 59-63
Author(s):  
Lei Guo ◽  
Chuan Sheng Wang ◽  
Hui Guang Bian
Keyword(s):  
Composite Material ◽  
Velocity Field ◽  
Flow Field ◽  
Force Field ◽  
Pressure Field ◽  
Short Fiber ◽  
Special Structure ◽  
Shearing Force ◽  
Rubber Composite ◽  
Flow Situation

The six-wing synchronous varying clearance rotors which have been designed for the mixing of short fiber-rubber composite material have special structure, and considering the characteristic of the short fiber-rubber composite material, the flow situation of mixed rubber is very complex. However, the flow field of the six-wing synchronous varying clearance rotors can be analyzed by ADINA. So, the flow situation and mixing situation of the mixed rubber can be analyzed and judged by the FEA results such as the pressure field, viscosity field, shearing force field and velocity field.

Millimetre-wave and infrared spectroscopy of Br13 CN: anharmonic force field of cyanogen bromide from spectroscopic data and ab initio calculations

1997 ◽  
Vol 90 (3) ◽  
pp. 495-497
Author(s):  
CLAUDIO ESPOSTI ◽  
FILIPPO TAMASSIA ◽  
CRISTINA PUZZARINI ◽  
RICCARDO TARRONI ◽  
ZDENEK ZELINGER
Keyword(s):  
Infrared Spectroscopy ◽  
Force Field ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Spectroscopic Data ◽  
Cyanogen Bromide ◽  
Millimetre Wave ◽  
Anharmonic Force
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