Development of a hydrodynamic free surface capability in a low order aerodynamic panel method

1995 ◽  
Author(s):  
Charles Adler ◽  
Robert Coopersmith
Keyword(s):  
Free Surface ◽  
Panel Method ◽  
Low Order

scholarly journals A Wake Model for the Prediction of Propeller Performance at Low Advance Ratios

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Ye Tian ◽  
Spyros A. Kinnas
Keyword(s):  
Experimental Data ◽  
Panel Method ◽  
Model Based ◽  
Pressure Distributions ◽  
Alignment Model ◽  
Wake Model ◽  
Propeller Performance ◽  
Wake Alignment ◽  
Low Order

A low order panel method is used to predict the performance of propellers. A wake alignment model based on a pseudounsteady scheme is proposed and implemented. The results from this full wake alignment (FWA) model are correlated with available experimental data, and results from RANS for some propellers at design and low advance ratios. Significant improvements have been found in the predicted integrated forces and pressure distributions.

Prediction of tip vortex cavitation inception with low-order panel method

2016 ◽  
Vol 125 ◽  
pp. 124-133 ◽  
Author(s):  
Youjiang Wang ◽  
Moustafa Abdel-Maksoud ◽  
Keqi Wang ◽  
Baowei Song
Keyword(s):  
Panel Method ◽  
Tip Vortex ◽  
Tip Vortex Cavitation ◽  
Cavitation Inception ◽  
Low Order

Added mass coefficients for submerged bodies by a low-order panel method

1993 ◽  
Author(s):  
ISKENDER SAHIN ◽  
JAN CRANE ◽  
KENNARD WATSON
Keyword(s):  
Added Mass ◽  
Panel Method ◽  
Low Order

scholarly journals Waves’ Numerical Dispersion and Damping due to Discrete Dispersion Relation

2014 ◽  
Author(s):  
Babak Ommani ◽  
Odd M. Faltinsen
Keyword(s):  
Free Surface ◽  
Dispersion Relation ◽  
Surface Waves ◽  
Boundary Integral ◽  
Panel Method ◽  
Numerical Dispersion ◽  
Finite Difference Schemes ◽  
Rankine Panel Method ◽  
Free Surface Waves ◽  
The Waves

In linear Rankine panel method, the discrete linear dispersion relation is solved on a discrete free-surface to capture the free-surface waves generated due to wave-body interactions. Discretization introduces numerical damping and dispersion, which depend on the discretization order and the chosen methods for differentiation in time and space. The numerical properties of a linear Rankine panel method, based on a direct boundary integral formulation, for capturing two and three dimensional free-surface waves were studied. Different discretization orders and differentiation methods were considered, focusing on the linear distribution and finite difference schemes. The possible sources for numerical instabilities were addressed. A series of cases with and without forward speed was selected, and numerical investigations are presented. For the waves in three dimensions, the influence of the panels’ aspect ratio and the waves’ angle were considered. It has been shown that using the cancellation effects of different differentiation schemes the accuracy of the numerical method could be improved.

Flow around circular and noncircular cylinders by a low-order panel method

1998 ◽  
Vol 25 (7) ◽  
pp. 529-539
Author(s):  
Iskender Sahin ◽  
Noriaki Okita
Keyword(s):  
Panel Method ◽  
Low Order

Impulsive flow around cylinders by a low-order panel method

1995 ◽  
Author(s):  
Iskender Sahin ◽  
Noriaki Okita
Keyword(s):  
Panel Method ◽  
Low Order

Boundary-Element Methods In Offshore Structure Analysis

2002 ◽  
Vol 124 (2) ◽  
pp. 81-89 ◽  
Author(s):  
J. N. Newman ◽  
C.-H. Lee
Keyword(s):  
Boundary Element ◽  
Velocity Potential ◽  
Practical Importance ◽  
Panel Method ◽  
Boundary Element Methods ◽  
Computational Time ◽  
Order Method ◽  
Offshore Structure ◽  
B Splines ◽  
Low Order

Boundary-element methods, also known as panel methods, have been widely used for computations of wave loads and other hydrodynamic characteristics associated with the interactions of offshore structures with waves. In the conventional approach, based on the low-order panel method, the submerged surface of the structure is represented by a large number of small quadrilateral plane elements, and the solution for the velocity potential or source strength is approximated by a constant value on each element. In this paper, we describe two recent developments of the panel method. One is a higher-order method where the submerged surface can be represented exactly, or approximated to a high degree of accuracy by B-splines, and the velocity potential is also approximated by B-splines. This technique, which was first used in the research code HIPAN, has now been extended and implemented in WAMIT. In many cases of practical importance, it is now possible to represent the geometry exactly to avoid the extra work required previously to develop panel input files for each structure. It is also possible to combine the same or different structures which are represented in this manner, to analyze multiple-body hydrodynamic interactions. Also described is the pre-corrected Fast Fourier Transform method (pFFT) which can reduce the computational time and required memory of the low-order method by an order of magnitude. In addition to descriptions of the two methods, several different applications are presented.

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