# Which is the most efficient way to compute force coefficients?

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 December 12, 2014, 01:17 Which is the most efficient way to compute force coefficients? #1 New Member   Leonardo Antonio de Araujo Join Date: Feb 2014 Location: Porto Alegre Posts: 16 Rep Power: 4 Hello all, in the case of my research, I'm using direct numerical simulation to compute the flow around a cylinder for the laminar case (Reynolds around ~ 100) through high order finite difference scheme (6th order). The cylinder is subjected to one-degree-of-freedom vortex-induced vibration (VIV) in the transverse direction to the flow (y axis). Right now, I compute the aerodynamic/hydrodynamic coefficients (drag and lift coefficient) through the conservation of momentum equation which uses a control volume (0.75D distanced to each side of the cylinder). Due to the cylinder displacement, there is a lot of noise in the time signal of the coefficients. I'm using a cartesian mesh which isn't conformed to the cylinder. Is this the most efficient way that minimizes numerical error? For example, a paper by Shiels (2001) uses a vorticity scheme (referred on link). I suppose that integrating along the surface of the cylinder would increase the error. Thanks in advance for any highlights

 Tags cylinder, drag, force coefficients, lift, viv

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