# Experimental and Computational Fluid Dynamic Study of Water Flow and Submerged Depth Effects on a Tidal Turbine Performance

^{1}

^{2}

^{3}

^{*}

## Abstract

**:**

## 1. Introduction

## 2. Methodology

_{c}represents the distance between the center of the blade chord and the blade drum when the blades are opened or closed. Additionally, Rt is the distance between the drum shaft and the fully open turbine blade. The angle of rotation is denoted by θ in this system, and θ1 is the angle between the flow and the drum to the center of the blade.

_{p}) is defined as the ratio of the actual power output (P) of the turbine to the power available in the incoming water flow (½ρAU

^{3}). The parameters A, ρ, U, and T represent the cross-sectional area of the turbine, water density, the velocity of the incoming flow, and the produced torque on the turbine, respectively.

_{p}can be calculated. However, in the experimental test, the water in the testing tunnel is motionless, the barge that holds the turbine moves with a specific speed, and the produced torque on the turbine is driven from the digital setup installed on the turbine.

## 3. Setup

## 4. Numerical Setup

## 5. Results and Discussion

#### 5.1. The Performance of a Stand-Alone Turbine

_{p}, and then decreases. The power coefficient obtained from the numerical solution for a flow coefficient of 0.47 was 0.185, while the experimental data yielded a power coefficient of 0.177. The turbine reaches its maximum performance at a flow coefficient of 0.47 for a submerged depth of 2D. The comparison of generated power by changing the flow velocity for the experimental test and the numerical simulation is presented in Table 1, which shows a small difference between the experimental and simulation results. The difference between the experimental and numerical simulations is because of two main factors: 1. experimental errors; 2. assumptions and boundary conditions in the computational domain.

#### 5.2. Effect of Turbine Submerged Depth on Its Performance

## 6. Conclusions

## Author Contributions

## Funding

## Data Availability Statement

## Conflicts of Interest

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**Figure 9.**Velocity contours for 3D from θ = 0, 20, 50 and Cf 0.4 and 0.46. ((

**a**): θ = 0, Cf = 0.4; (

**b**): θ = 20, Cf = 0.4; (

**c**): θ = 50, Cf = 0.4; (

**d**): θ = 0, Cf = 0.46; (

**e**): θ = 20, Cf = 0.46; (

**f**): θ = 50, Cf = 0.46). θ = 0, 20, 50 and Cf 0.49 and 0.52. ((

**g**): θ = 0, Cf = 0.49; (

**h**): θ = 20, Cf = 0.49; (

**i**): θ = 50, Cf = 0.49; (

**j**): θ = 0, Cf = 0.52; (

**k**): θ = 20, Cf = 0.52; (

**l**): θ = 50, Cf = 0.52).

**Figure 10.**Pressure contours for 3D from θ = 0, 20, 50 and Cf 0.4 and 0.46. ((

**a**): θ = 0, Cf = 0.4; (

**b**): θ = 20, Cf = 0.4; (

**c**): θ = 50, Cf = 0.4; (

**d**): θ = 0, Cf = 0.46; (

**e**): θ = 20, Cf = 0.46; (

**f**): θ = 50, Cf = 0.46). θ = 0, 20, 50 and Cf 0.49 and 0.52. ((

**g**): θ = 0, Cf = 0.49; (

**h**): θ = 20, Cf = 0.49; (

**i**): θ = 50, Cf = 0.49; (

**j**): θ = 0, Cf = 0.52; (

**k**): θ = 20, Cf = 0.52; (

**l**): θ = 50, Cf = 0.52).

**Figure 12.**The pressure contours of the turbine in different vertical positions, with a rotation angle of 50 and a flow coefficient of 0.46.

**Figure 13.**The trend of change of total torque with angle of rotation with various flow coefficients in 1D depth.

**Figure 14.**The trend of change of total torque with angle of rotation with various flow coefficients in 2D depth.

**Figure 15.**The trend of change of total torque with angle of rotation with various flow coefficients in 3D depth.

**Figure 16.**The trend of change of total torque with angle of rotation with various flow coefficients in 4D depth.

**Figure 17.**The trend of change of power coefficient with angle of rotation with various flow coefficients in 1D depth.

**Figure 18.**The trend of change of power coefficient with angle of rotation with various flow coefficients in 2D depth.

**Figure 19.**The trend of change of power coefficient with angle of rotation with various flow coefficients in 3D depth.

**Figure 20.**The trend of change of power coefficient with angle of rotation with various flow coefficients in 4D depth.

Velocity (m/s) | Power (w)—Exp. | Power (w)—Nu. |
---|---|---|

0.4 | 0.017 | 0.09 |

0.7 | 0.11 | 0.17 |

0.8 | 0.19 | 0.29 |

1 | 0.44 | 0.53 |

1.2 | 0.58 | 0.78 |

1.4 | 0.89 | 1.06 |

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**MDPI and ACS Style**

Ghamati, E.; Kariman, H.; Hoseinzadeh, S.
Experimental and Computational Fluid Dynamic Study of Water Flow and Submerged Depth Effects on a Tidal Turbine Performance. *Water* **2023**, *15*, 2312.
https://doi.org/10.3390/w15132312

**AMA Style**

Ghamati E, Kariman H, Hoseinzadeh S.
Experimental and Computational Fluid Dynamic Study of Water Flow and Submerged Depth Effects on a Tidal Turbine Performance. *Water*. 2023; 15(13):2312.
https://doi.org/10.3390/w15132312

**Chicago/Turabian Style**

Ghamati, Erfan, Hamed Kariman, and Siamak Hoseinzadeh.
2023. "Experimental and Computational Fluid Dynamic Study of Water Flow and Submerged Depth Effects on a Tidal Turbine Performance" *Water* 15, no. 13: 2312.
https://doi.org/10.3390/w15132312