Preprint Article Version 1 This version not peer reviewed

Computational Fluid Dynamics (CFD) Mesh Independency Study of A Straight Blade Horizontal Axis Tidal Turbine

Version 1 : Received: 1 August 2016 / Approved: 2 August 2016 / Online: 2 August 2016 (04:45:13 CEST)

How to cite: Kulkarni, S.S.; Chapman, C.; Shah, H. Computational Fluid Dynamics (CFD) Mesh Independency Study of A Straight Blade Horizontal Axis Tidal Turbine. Preprints 2016, 2016080008 (doi: 10.20944/preprints201608.0008.v1). Kulkarni, S.S.; Chapman, C.; Shah, H. Computational Fluid Dynamics (CFD) Mesh Independency Study of A Straight Blade Horizontal Axis Tidal Turbine. Preprints 2016, 2016080008 (doi: 10.20944/preprints201608.0008.v1).

Abstract

This paper numerically investigates a 3D mesh independency study of a straight blade horizontal axis tidal turbine modelled using Computational Fluid Dynamics (CFD). The solution was produced by employing two turbulence models, the standard k-ε model and Shear Stress Transport (SST) in ANSYS CFX. Three parameters were investigated: mesh resolution, turbulence model, and power coefficient in the initial CFD, analysis. It was found that the mesh resolution and the turbulence model affect the power coefficient results. The power coefficients obtained from the standard k-ε model are 15% to 20% lower than the accuracy of the SST model. It can also be demonstrated that the torque coefficient increases with the increasing Tip Speed Ratio (TSR), but drops drastically after TSR = 5 and k-ε model failing to capture the non-linearity in the torque coefficient with the increasing TSR.

Subject Areas

horizontal axis tidal turbine; Computational Fluid Dynamics; mesh independency; NACA 0018

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