Modelling of bubble dynamics in a venturi flow with a potential flow method

2001 ◽  
Vol 56 (21-22) ◽  
pp. 6427-6435 ◽  
Author(s):  
M.J Gaston ◽  
J.A Reizes ◽  
G.M Evans
Keyword(s):  
Potential Flow ◽  
Bubble Dynamics ◽  
Flow Method

scholarly journals Aerodynamic analysis of multirotor vehicles using a higher-order potential flow method

2021 ◽  
Author(s):  
Devin F. Barcelos
Keyword(s):  
Performance Prediction ◽  
Potential Flow ◽  
Higher Order ◽  
Theory Approach ◽  
Blade Element Momentum Theory ◽  
Flow Method ◽  
Momentum Theory ◽  
Radial Loading ◽  
Rotational Direction ◽  
Blade Element

A higher-order potential flow method is adapted for the aerodynamic performance prediction of small rotors used in multirotor unmanned aerial vehicles. The method uses elements of distributed vorticity which results in numerical robustness with both a prescribed and relaxed wake representation. The radial loading and wake shapes of a rotor in hover were compared to experiment to show strong agreement for three disk loadings. The advancing flight performance prediction of a single rotor was compared to a single rotor was compared to a blade element momentum theory based approach and to experiment. Comparison showed good thrust and power agreement with experiment across a range of advance ratios and angles of attack. Prediction in descending flights showed improvements in comparison to the blade element momentum theory approach. The model was extended to a quadrotorm configuration showing the differences associated to vehicle orientation and rotor rotational direction.

Prediction of WIPP Data using a Relaxed-Wake Potential Flow Method

2020 ◽  
Author(s):  
Julia A. Cole ◽  
Devin Barcelos ◽  
Travis Krebs ◽  
Michael Melville ◽  
Goetz Bramesfeld
Keyword(s):  
Potential Flow ◽  
Flow Method

Simulation of characteristics of tuned liquid column damper using a potential-flow method

2007 ◽  
Vol 29 (1) ◽  
pp. 132-144 ◽  
Author(s):  
P. Chaiviriyawong ◽  
W.C. Webster ◽  
T. Pinkaew ◽  
P. Lukkunaprasit
Keyword(s):  
Potential Flow ◽  
Liquid Column ◽  
Flow Method ◽  
Tuned Liquid Column Damper ◽  
Liquid Column Damper

Three Dimensional Inviscid Computation of an Impeller Flow

1983 ◽  
Author(s):  
T. C. Prince ◽  
A. C. Bryans
Keyword(s):  
Finite Element ◽  
Potential Flow ◽  
Three Dimensional ◽  
Method Comparison ◽  
Centrifugal Impeller ◽  
Published Data ◽  
Flow Method ◽  
Streamline Curvature ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The flow in a centrifugal impeller is analyzed by a quasi-three-dimensional streamline curvature method, by a three-dimensional Euler code, and by a three-dimensional finite element potential flow method. Comparison with Eckardt’s published data for a backswept impeller shows that full three-dimensional methods better predict the loading at the hub and shroud.

Boundary Element Simulations of Free and Forced Bubble Oscillations in Potential Flow

2014 ◽  
Author(s):  
Yulia A. Itkulova ◽  
Olga A. Abramova ◽  
Nail Gumerov ◽  
Iskander Akhatov
Keyword(s):  
Boundary Element ◽  
Potential Flow ◽  
Bubble Dynamics ◽  
Fast Multipole Method ◽  
Computational Cost ◽  
Bubble Surface ◽  
Graphics Processors ◽  
Problem Size ◽  
Linear Interaction ◽  
Bubble Oscillations

The study of shrinking, expanding, and strongly interacting bubbles at high Reynolds numbers is of significant interest for micro- and nanotechnologies. One of such interests is related to self-propulsion of bubbles due to non-linear interaction of bubble shape modes. In the present study bubble dynamics in potential flow is considered. The boundary element method (BEM) which offers a low computational cost and provides an accurate representation of bubble surface is employed for studies. To accelerate computations and increase problem size the fast multipole method (FMM) and graphics processors (GPUs) are used. For mesh stabilization, which appears to be an issue, a new parametric spherical filter based on spherical harmonic expansion is developed and implemented. The dynamics of high order surface modes of bubble at free and forced bubble oscillations is studied.

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