Validation of a CFD Model for Coupled Simulation of Nozzle Flow, Primary Fuel Jet Break-Up and Spray Formation

2003 ◽  
Author(s):  
E. v. Berg ◽  
W. Edelbauer ◽  
R. Tatschl ◽  
M. Volmajer ◽  
B. Kegl ◽  
...  
Keyword(s):  
Fluid Model ◽  
Liquid Core ◽  
Nozzle Flow ◽  
Coupled Simulation ◽  
Nozzle Orifice ◽  
Spray Formation ◽  
Break Up ◽  
Two Fluid Model ◽  
Two Fluid ◽  
Primary Break

A coupled simulation methodology for cavitating nozzle flow and spray formation has been developed at AVL and applied within the framework of the FIRE CFD code. In this approach a two-fluid model for cavitating nozzle flow inside the injector and a primary break-up model applied at the nozzle orifice are combined with the standard Discrete Droplet Model (DDM). Using an alternative calculation method presently also an approach with an Eulerian multi-fluid model applied for the nozzle and spray regions together is developed. A two-fluid model is used to simulate injector flows. The primary break-up model developed is based on locally resolved properties of the cavitating nozzle flow in the orifice cross section. The model delivers the initial droplet size and velocity distribution with droplet parcels released from the surface of a coherent liquid core. The characteristic feature of the results from the model is a remarkable asymmetry of the spray. Recent experimental findings from Chalmers University gained from a transparent model injector are used for model validation.

Coupled Simulations of Nozzle Flow, Primary Fuel Jet Breakup, and Spray Formation

2004 ◽  
Vol 127 (4) ◽  
pp. 897-908 ◽  
Author(s):  
Eberhard von Berg ◽  
Wilfried Edelbauer ◽  
Ales Alajbegovic ◽  
Reinhard Tatschl ◽  
Martin Volmajer ◽  
...  
Keyword(s):  
Fluid Model ◽  
Liquid Core ◽  
Nozzle Flow ◽  
Nozzle Orifice ◽  
Spray Formation ◽  
Jet Breakup ◽  
Fuel Jet ◽  
Primary Breakup ◽  
Two Fluid Model ◽  
Breakup Model

Presented are two approaches for coupled simulations of the injector flow with spray formation. In the first approach the two-fluid model is used within the injector for the cavitating flow. A primary breakup model is then applied at the nozzle orifice where it is coupled with the standard discrete droplet model. In the second approach the Eulerian multi-fluid model is applied for both the nozzle and spray regions. The developed primary breakup model, used in both approaches, is based on locally resolved properties of the cavitating nozzle flow across the orifice cross section. The model provides the initial droplet size and velocity distribution for the droplet parcels released from the surface of a coherent liquid core. The major feature of the predictions obtained with the model is a remarkable asymmetry of the spray. This asymmetry is in agreement with the recent observations at Chalmers University where they performed experiments using a transparent model scaled-up injector. The described model has been implemented into AVL FIRE computational fluid dynamics code which was used to obtain all the presented results.

scholarly journals Natural modes of the two-fluid model of two-phase flow

2021 ◽  
Vol 33 (3) ◽  
pp. 033324
Author(s):  
Alejandro Clausse ◽  
Martín López de Bertodano
Keyword(s):  
Two Phase Flow ◽  
Fluid Model ◽  
Phase Flow ◽  
Two Phase ◽  
Natural Modes ◽  
Two Fluid Model ◽  
Two Fluid

Self-consistent hydrodynamic two-fluid model of vortex plasma

2021 ◽  
Vol 33 (3) ◽  
pp. 037116
Author(s):  
Victor L. Mironov
Keyword(s):  
Fluid Model ◽  
Self Consistent ◽  
Two Fluid Model ◽  
Two Fluid

scholarly journals Mathematical study on two-fluid model for flow of K–L fluid in a stenosed artery with porous wall

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
R. Ponalagusamy ◽  
Ramakrishna Manchi
Keyword(s):  
Theoretical Study ◽  
Fluid Model ◽  
Porous Wall ◽  
Governing Equations ◽  
Rate Of Increase ◽  
Special Cases ◽  
Stenosed Artery ◽  
Flow Through ◽  
Two Fluid Model ◽  
Two Fluid

AbstractThe present communication presents a theoretical study of blood flow through a stenotic artery with a porous wall comprising Brinkman and Darcy layers. The governing equations describing the flow subjected to the boundary conditions have been solved analytically under the low Reynolds number and mild stenosis assumptions. Some special cases of the problem are also presented mathematically. The significant effects of the rheology of blood and porous wall of the artery on physiological flow quantities have been investigated. The results reveal that the wall shear stress at the stenotic throat increases dramatically for the thinner porous wall (i.e. smaller values of the Brinkman and Darcy regions) and the rate of increase is found to be 18.46% while it decreases for the thicker porous wall (i.e. higher values of the Brinkman and Darcy regions) and the rate of decrease is found to be 10.21%. Further, the streamline pattern in the stenotic region has been plotted and discussed.

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