An IGA-BEM method for the open-water marine propeller flow problem

S.P. Chouliaras, P.D. Kaklis, A.-A.I. Ginnis, K.V. Kostas, C.G. Politis

Research output: Contribution to conferenceSpeechpeer-review

4 Downloads (Pure)

Abstract

In this work we deal with the problem of flow around a marine propeller rotating with constant angular velocity in a stream of uniform velocity parallel with propeller's axis (open-water of operation). The flow is considered to be inviscid, incompressible and irrotational except from the wake, which an a-priori unknown force-free vortex sheet surface emanating from the trailing edge of each blade. In this setting, the problem can be formulated as a Fredholm Boundary Integral Equation of the 2nd kind with respect to the strength of normal dipoles distributed over the propeller's boundary and the wake [2]. This BIE is accompanied by conditions on the wake, namely no flow and no pressure jump across it, as well as appropriate conditions for vanishing disturbance at infinity [1]. Adopting the concept of Isogeometric Analysis (IGA), the solution of
the continuous problem is approximated via a discrete space involving a bicubic T-spline basis used for representing the propeller's boundary surface. The resulting non-linear system is solved iteratively so that the shape of the wake secures zero-pressure jump through it (wake alignment) [3]. Using an in-house developed code, the proposed IGA-BEM scheme is tested against simple (e.g., cycloid) blade shapes and its performance is compared with results available in pertinet literature.
Original languageEnglish
Number of pages22
Publication statusPublished - 13 Sep 2017
EventIGA 2017 - V International Conference on Isogeometric Analysis - Pavia, Italy
Duration: 11 Sep 201713 Sep 2017
http://congress.cimne.com/IGA2017/frontal/default.asp

Conference

ConferenceIGA 2017 - V International Conference on Isogeometric Analysis
Country/TerritoryItaly
CityPavia
Period11/09/1713/09/17
Internet address

Keywords

  • isogeometric analysis (IGA)
  • boundary element methods (BEM)
  • open-water marine propeller flow problem
  • steady state problem
  • perturbation potential
  • boundary integral equation
  • zero pressure jump
  • Kutta

Cite this