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Laminar and turbulent channel flow simulation using residual based variational multi-scale method
Yousef Ghaffari Motlagh,Hyung Taek Ahn 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.2
We present a residual-based isogeometric variational multiscale method to solve laminar and turbulent channel flow. Residual-based variational multiscale method is a new finite element formulation for solving turbulent flows using a large-eddy simulation type modeling. Isogeometric analysis, a new finite element method using CAD blending functions as its basis functions, is employed for higher order approximation of the solution. First, laminar flow with Re 0.55 τ = through flat channel is considered and linear, quadratic and cubic basis functions, which are C0, C1, and C2 -continuous across element boundaries, respectively are employed and their accuracy is presented by the comparison with analytical result. Next, same methodology is applied to the turbulent channel flow with Re 180 τ = . Current results are validated by the comparison of turbulence statistics using available DNS data.
안형택(H.T. Ahn),Yousef Ghaffari Motlagh,Thomas J.R. Hughes 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Variational multiscale(VMS) simulation of laminar flow around a circular cylinder is presented. VMS formulation is employed for simulating flows around a bluff body, namely circular cylinder. Isogeometric analysis(IGA) techinque, an enhanced Finite Element Method using the quadratic NURBS basis functions, is employed for the exact representation of the circular geometry of the cylinder as well as higher order (>2nd) and C<SUP>1</SUP> continuous approximation of the solution.