Two and three-dimensional viscous analyses of high speed inlets and comparison with experimental data

1997 ◽  
Author(s):  
E. Duman ◽  
B. Sekar ◽  
J. Wolff ◽  
E. Duman ◽  
B. Sekar ◽  
...  
Keyword(s):  
Experimental Data ◽  
High Speed ◽  
Three Dimensional ◽  
Comparison With Experimental Data

Development and Validation of a Three-Dimensional Multiphase Flow CFD Analysis for Journal Bearings in Steam and Heavy Duty Gas Turbines

2012 ◽  
Author(s):  
Stephan Uhkoetter ◽  
Stefan aus der Wiesche ◽  
Michael Kursch ◽  
Christian Beck
Keyword(s):  
Experimental Data ◽  
Multiphase Flow ◽  
Gas Turbines ◽  
High Speed ◽  
Three Dimensional ◽  
Air Entrainment ◽  
Journal Bearings ◽  
Heavy Duty ◽  
Present Contribution ◽  
Two Phase

The traditional method for hydrodynamic journal bearing analysis usually applies the lubrication theory based on the Reynolds equation and suitable empirical modifications to cover turbulence, heat transfer, and cavitation. In cases of complex bearing geometries for steam and heavy-duty gas turbines this approach has its obvious restrictions in regard to detail flow recirculation, mixing, mass balance, and filling level phenomena. These limitations could be circumvented by applying a computational fluid dynamics (CFD) approach resting closer to the fundamental physical laws. The present contribution reports about the state of the art of such a fully three-dimensional multiphase-flow CFD approach including cavitation and air entrainment for high-speed turbo-machinery journal bearings. It has been developed and validated using experimental data. Due to the high ambient shear rates in bearings, the multiphase-flow model for journal bearings requires substantial modifications in comparison to common two-phase flow simulations. Based on experimental data, it is found, that particular cavitation phenomena are essential for the understanding of steam and heavy-duty type gas turbine journal bearings.

Theoretical Evaluation of the Effects of the Impeller Entrance Geometry and of the Incident Angle on Cavitation Inception in Centrifugal Pumps

1995 ◽  
Vol 209 (1) ◽  
pp. 29-38 ◽  
Author(s):  
G Ardizzon ◽  
G Pavesi
Keyword(s):  
Experimental Data ◽  
Pressure Drop ◽  
Present Model ◽  
Incident Angle ◽  
Three Dimensional ◽  
Centrifugal Pumps ◽  
Theoretical Evaluation ◽  
Cavitation Inception ◽  
Cavitation Performance ◽  
Comparison With Experimental Data

A method, based on quasi three-dimensional analysis, of describing pump cavitation behaviour is proposed. Cavitation performance is related to impeller entrance design and the influence of the angle of attack of the leading edges on the flow is studied. Coefficients are derived from the pressure drop due separately to the vanes and shroud. The influence of incident angle on cavitation is shown as a function of the blade geometry and discussed. By comparison with experimental data on centrifugal pumps, it is shown that the present model can simulate the characteristics of inception cavitation at design and off-design conditions.

Three-dimensional viscoelastic simulation of coextrusion process: comparison with experimental data

2002 ◽  
Vol 41 (1-2) ◽  
pp. 144-153 ◽  
Author(s):  
Ki Byung Sunwoo ◽  
Seung Joon Park ◽  
Seong Jae Lee ◽  
Kyung Hyun Ahn ◽  
Seung Jong Lee
Keyword(s):  
Experimental Data ◽  
Three Dimensional ◽  
Process Comparison ◽  
Comparison With Experimental Data

Preliminary Numerical Investigation of Effect of Interceptor on Ship Resistance

2011 ◽  
Vol 97-98 ◽  
pp. 1085-1090 ◽  
Author(s):  
Rui Deng ◽  
De Bo Huang ◽  
Guang Li Zhou ◽  
Hua Wei Sun
Keyword(s):  
Experimental Data ◽  
Flow Field ◽  
Numerical Investigation ◽  
Satisfactory Agreement ◽  
High Speed ◽  
Three Dimensional ◽  
Numerical Results ◽  
Two Dimensional ◽  
Ship Resistance ◽  
The Right

In the present work, the CFD software FLUENT is used to calculate the ship resistance and simulate the flow field around it. Comparison of the numerical results with experimental data of the ship without interceptor shows basically satisfactory agreement in the case of high-speed. In order to get the right parameters of the interceptor for the ship, some two dimensional calculation is taken to study the influence of interceptor with different size. The simulation of the three dimensional vessel with interceptor is also included, and the effect is discussed.

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