A fast method to realize the pressure Kutta condition in boundary element method for lifting bodies

Publikationstyp
Journal Article
Date Issued
2016-12-13
Sprache
English
Author(s)
Wang, Youjiang  orcid-logo
Abdel-Maksoud, Moustafa  orcid-logo
Song, Baowei  
Institut
Fluiddynamik und Schiffstheorie M-8  
TORE-URI
http://hdl.handle.net/11420/3256
Journal
Ocean engineering  
Volume
130
Start Page
398
End Page
406
Citation
Ocean Engineering (130): 398-406 (2017-01-15)
Publisher DOI
10.1016/j.oceaneng.2016.12.009
Scopus ID
2-s2.0-85003936050
Publisher
Elsevier Science
The Newton–Raphson method is always employed to realize the zero pressure jump at the trailing edge of lifting bodies, which is required by pressure Kutta condition. This paper describes an analytical method to evaluate the Jacobian matrix during this procedure. With the proposed method, the computation time of the Jacobian matrix is less than that with the conventional method by five orders of magnitude. This allows for calculating the Jacobian matrix in every iteration of the Newton–Raphson method, which accelerates the convergence rate. In addition, a fast method, called the dipole increment method, to update the unknown singularities on the body surface during the Newton–Raphson procedure is also presented. Combination of these two methods makes the time consumed by the nonlinear pressure Kutta condition negligible (less than 2% of the total simulation time) in the boundary element method for both steady and unsteady flows.
Subjects
Boundary element method
Jacobian matrix
Kutta condition
Panel method
DDC Class
600: Technik
More Funding Information
Thefirst author is sponsored by China Scholarship Council.