To investigate hydrodynamic interaction between twin vertical axis turbine working side by side using CFX

Renewable resources are getting popularity day by day due to its nonpolluting and easy available factors. The harvested power of tidal turbine can be increased through using tidal farm concept. Initially single turbine is analyzed for computational fluid dynamic analysis in ANSYS-CFX for transient Shear Stress Transport model. And then twin turbines working side-by-side is analyzed for hydrodynamic investigation. The aim is to find a suitable distance among the turbines where interaction effect is minimum and useful, and the turbines work more effectively than standalone turbine. Some parameters like torque, performance coefficient, torque coefficient and power are calculated. The space between the turbines affects the above mentioned parameters and performance can be improved at an ideal distance where vortex and turbulent affects are very small. The flow around two counters rotating vertical axis turbine systems is analyzed and results are compared with Li & Calisal data. Because there is little or no data published on twin vertical axis tidal turbine. These results show that ANSYS-CFX can be used to analyze twin turbine. The results prove that the output power with suitable layout of twin-turbines can be 29.5% more than 02 times that of a single turbine. Numerical results indicate that the relative distance and phase angle between the twin turbine rotors influence the overall performance of dual turbines moving abreast. We can conclude that turbine rotating side to side at an ideal distance can improve twin turbine efficiency.