*Article* **Development of a Computational Model for Investigation of and Oscillating Water Column Device with a Savonius Turbine**

**Amanda Lopes dos Santos 1, Cristiano Fragassa 2,\*, Andrei Luís Garcia Santos 3, Rodrigo Spotorno Vieira 4, Luiz Alberto Oliveira Rocha 4, José Manuel Paixão Conde 5, Liércio André Isoldi 1,2 and Elizaldo Domingues dos Santos 1,2**


**Abstract:** The present work aims to develop a computational model investigating turbulent flows in a problem that simulates an oscillating water column device (OWC) considering a Savonius turbine in the air duct region. Incompressible, two-dimensional, unsteady, and turbulent flows were considered for three different configurations: (1) free turbine inserted in a long and large channel for verification/validation of the model, (2) an enclosure domain that mimics an OWC device with a constant velocity at its inlet, and (3) the same domain as that in *Case 2* with sinusoidal velocity imposed at the inlet. A dynamic rotational mesh in the turbine region was imposed. Time-averaged equations of the conservation of mass and balance of momentum with the *k*–*ω* Shear Stress Transport (SST) model for turbulence closure were solved with the finite volume method. The developed model led to promising results, predicting similar time–spatial-averaged power coefficients (*CP*) as those obtained in the literature for different magnitudes of the tip speed ratio (0.75 ≤ *λ* ≤ 2.00). The simulation of the enclosure domain increased *CP* for all studied values of *λ* in comparison with a free turbine (*Case 1*). The imposition of sinusoidal velocity (*Case 3*) led to a similar performance as that obtained for constant velocity (*Case 2*).

**Keywords:** computational model; oscillating water column; wave energy converter; turbulent flows; Savonius turbine
