A turbulence generator based on synthetic eddy method and momentum source term

  • He, Jundi (The University of Manchester)
  • Revell, Alistair (The University of Manchester)
  • Skillen, Alex (The University of Manchester)
  • Moulinec, Charles (Science and Technology Facilities Council)

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In the present study, a handy toolkit that generates user-specified turbulent flow in large eddy simulations (LES) has been developed, which is based on the synthetic eddy method and the source-term method. The turbulence generator is implemented as a box region placed at a user-specified location within the computational domain. Via a temporarily and spatially varying source term, instantaneous turbulent flow is generated downstream of the box. It is capable of generate instantaneous turbulent flow at a user-specified mean velocity and Reynolds stress tensor. Compared with the improved synthetic eddy method \cite{accuracy2016} which generates turbulence and implemented as Dirichlet boundary condition on a plane (iSEM-P), the turbulent flow generated by the source-term approach (iSEM-S) has a much shorter developing distance and allows the use of a larger time step. Moreover, it improves the flexibility and allow user to generate local turbulence at the region of interest, making it particularly suitable for detached eddy simulations (DES).