Numerical simulation of a flag behind a flat plate in a uniform flow

  • Jonathan Sanchez Muñoz

Student thesis: Phd


The dynamic response of a flexible flag in a uniform cross flow was studied using the Lattice Boltzmann Method combined with the Immersed Boundary Method. In the first instance the flag was alone, while subsequently it was attached to the aft of a rigid flat plate, positioned at various angles of incidence to the flow. Two different boundary conditions were used to describe the objects; the rigid flat plate was defined via the staircase approximation while the flexible flag was simulated using the immersed boundary method. Prior to the examination of the aforementioned cases a significant amount of code testing was undertaken towards the release of an in-houce code, LUMA (Lattice Boltzmann The University of Manchester) which has now been released via an academic journal publication in SoftwareX (2018). A mesh refinement study and a hardware performance analysis were completed in order to identify the most optimal use mode for this study. The flexible flag performance can be controlled through three main parameters Reynolds number, reduced velocity and mass ratio . The incidence angle of the flat plate is introduced as the new control parameter. The combination of these parameters modify the dynamical states of the flexible flag as well as downstream flow. By varying these parameters over the ranges (100
Date of Award1 Aug 2019
Original languageEnglish
Awarding Institution
  • The University of Manchester
SupervisorAlistair Revell (Supervisor) & Robert Prosser (Supervisor)


  • Low Reynolds
  • Bending rigidity
  • Flexible flag
  • Mass ratio
  • Immersed boundary Method
  • flat plate
  • Lattice Boltzmann Method

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