scholarly journals Inferring Compressible Fluid Dynamics From Vent Discharges During Volcanic Eruptions

2018 ◽  
Vol 45 (14) ◽  
pp. 7226-7235 ◽  
Author(s):  
J. S. Méndez Harper ◽  
C. Cimarelli ◽  
J. Dufek ◽  
D. Gaudin ◽  
R. J. Thomas
Keyword(s):  
Fluid Dynamics ◽  
Compressible Fluid ◽  
Volcanic Eruptions ◽  
Compressible Fluid Dynamics

scholarly journals AN INVESTIGATION TURBULENCE MODEL OF STANDARD k- TO GET OPTIMUM PARAMETERS OF TURBULENCE CONSTANTS (cµ, c1, AND c2) OF COMPRESSIBLE FLUID DYNAMICS IN A CONFINED JET

2021 ◽  
Vol 56 (5) ◽  
pp. 294-317
Author(s):  
A. I. Siswantara ◽  
H. Pujowidodo ◽  
M. A. Budiyanto ◽  
G. G. Ramdlan Gunadi ◽  
C. D. Widiawaty
Keyword(s):  
Fluid Dynamics ◽  
Turbulence Model ◽  
Compressible Fluid ◽  
Turbulence Modeling ◽  
Reference Model ◽  
Fluid Pressure ◽  
Secondary Data ◽  
Entrainment Ratio ◽  
Air Jet ◽  
Compressible Fluid Dynamics

This research aims to find the optimal standard k-e turbulence model constants (cµ, c1e, and c2e) for better predicting compressible fluid dynamics in an air jet ejector. The turbulence field in a jet flow plays an important role in influencing the performance of the momentum transfer process at a shear layer in nozzle application for momentum source and mixing process. In this research, some activities have been done before analyzing and optimizing the turbulence model constants, including preliminary turbulence modeling study for compressible flow in the air-jet ejector, verification, and validation with primary experimental data as well as by other secondary data. The preliminary studies in turbulence modeling presented that the turbulence modeling of a 3mm air jet-ejector resulted in a similar trend of the relation between entrainment ratio and motive fluid pressure. The results showed that the sensitive parameters in the standard k-emodel dissipation and diffusion terms, cµ, c1e, and c2e, strongly affected the optimum value of turbulence kinetic energy (k) and dissipation rate (e), compared to the reference model. Better k and e could be obtained by changing the c2e into positively proportional, but the cµ and c1e must be changed with opposite proportionality. It was found that the optimum standard k-e model constants in the case of air-jet ejector with 3 mm nozzle diameter for cµ, c1e, and c2e are 0.05, 1.48, and 1.88, respectively, with the error values for k being -8.88% and e being -17.44%.

scholarly journals Compressible-Fluid Dynamics

1972 ◽  
Vol 39 (2) ◽  
pp. 366-366 ◽  
Author(s):  
Philip A. Thompson ◽  
G. S. Beavers
Keyword(s):  
Fluid Dynamics ◽  
Compressible Fluid ◽  
Compressible Fluid Dynamics
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