scholarly journals An Eulerian two-phase model for steady sheet flow using large-eddy simulation methodology

2018 ◽  
Vol 111 ◽  
pp. 205-223 ◽  
Author(s):  
Zhen Cheng ◽  
Tian-Jian Hsu ◽  
Julien Chauchat
Keyword(s):  
Large Eddy Simulation ◽  
Phase Model ◽  
Sheet Flow ◽  
Two Phase ◽  
Simulation Methodology ◽  
Eddy Simulation ◽  
Large Eddy

Simulations of rocket launch noise suppression with water injection from impingement pad

2020 ◽  
Vol 19 (3-5) ◽  
pp. 207-239
Author(s):  
Saman Salehian ◽  
Reda R Mankbadi
Keyword(s):  
Large Eddy Simulation ◽  
Fluid Model ◽  
Water Injection ◽  
Broadband Noise ◽  
Computational Domain ◽  
Two Phase ◽  
Effect Of Water ◽  
Eddy Simulation ◽  
Impingement Plate ◽  
Large Eddy

The focus of this work is on understanding the effect of water injection from the launch pad on the noise generated during rocket’s lift-off. To simplify the problem, we consider a supersonic jet impinging on a flat plate with water injection from the impingement plate. The Volume of Fluid model is adopted in this work to simulate the two-phase flow. A Hybrid Large Eddy Simulation – Unsteady Reynolds Averaged Simulation approach is employed to model turbulence, wherein Unsteady Reynolds Averaged Simulation is used near the walls, and Large Eddy Simulation is used elsewhere in the computational domain. The numerical issues associated with simulating the noise of two-phase supersonic flow are addressed. The pressure fluctuations on the impingement plate obtained from numerical simulations agree well with the experimental data. Furthermore, the predicted effect of water injection on the far-field broadband noise is consistent with that of the experiment. The possible mechanisms for noise reduction by water injection are discussed.

Eulerian-Eulerian large eddy simulation of two-phase dilute bubbly flows

2019 ◽  
Vol 208 ◽  
pp. 115156 ◽  
Author(s):  
Mohammad Haji Mohammadi ◽  
Fotis Sotiropoulos ◽  
Joshua R. Brinkerhoff
Keyword(s):  
Large Eddy Simulation ◽  
Bubbly Flows ◽  
Two Phase ◽  
Eddy Simulation ◽  
Large Eddy

A Large-Eddy Simulation of Bubble-Liquid Jets

2002 ◽  
Author(s):  
M. Yang ◽  
L. X. Zhou ◽  
L. S. Fan
Keyword(s):  
Large Eddy Simulation ◽  
Liquid Jets ◽  
Order Moment ◽  
Two Phase ◽  
Confined Jets ◽  
Bubble Liquid ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Turbulence Generation ◽  
Shear Production

A Large-Eddy Simulation (LES) with a two-way coupling is used to study bubble-liquid two-phase confined jets in a two-dimensional channel. The results show the large-eddy vortex structures of both liquid flow and bubble motion, the shear-generated and bubble-induced liquid turbulence. For comparison, the second-order moment (SOM) modeling was also carried out for the same case. Both LES and SOM results indicate much stronger bubble fluctuation than the liquid fluctuation, the enhancement of liquid turbulence by bubbles even for the higher velocity case. Both shear production and the production due to bubble-liquid interaction are important for the liquid turbulence generation in the case studied. The LES statistical results and the SOM simulation results are in qualitative agreement with each other.

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