Abstract
A discrete forcing based Cartesian grid method is presented. The non-staggered arrangement of velocity and pressure is considered. The pressure gradient in localized discrete form is added separately with the velocity making them explicitly coupled. The governing equation is time-integrated implicitly with both linearized and non-linear forms are investigated. Both linear and bi-linear reconstruction techniques are tested for extrapolation of velocity near a complex boundary. The present method is tested for vortical flow in an inclined cavity, flow past circular and inclined square cylinder. Both homogeneous and non-homogeneous Dirichlet forcing problems are tested. The parallelized version of the method is applied to 2D-to-3D transitional flow behind a single and multiple circular cylinders. The present numerical results compare well with the previously documented results.
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Acknowledgements
The present research was carried out through the funds available from the institute start-up grant R&D/07/SG/ME/P/ARKD/1/2009-2010. The author thanks Prof. Vinayak Eswaran for his invaluable inputs.
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Appendix A
Appendix A
The discrete linear equations (A ϕ=b) arising from the governing equations can be cast into a septa-diagonal form
where a B =a T =0 in the two-dimensional form. Diagonals of the lower (L W,L S,L P,L B) and upper (U E,U N,U T) triangular factors, obtained by the normal LU factorization procedure along with the implicit relations proposed by Stone (1968), are given below
with γ being a implicit factor and γ≈0.9 gives the best convergence for a range of problems. The above factors reduce the original linear system into a two-step substitution procedure
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DE, A.K. An implicit non-staggered Cartesian grid method for incompressible viscous flows in complex geometries. Sadhana 39, 1071–1094 (2014). https://doi.org/10.1007/s12046-014-0269-y
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DOI: https://doi.org/10.1007/s12046-014-0269-y