When towing the immersed tube element in water, the calculation of the water resistance coefficient is important. However, the variation range of the water resistance coefficient is relatively large, which makes the traditional physical model test difficult and expensive. In the present study, the water resistance coefficient of a large immersed tube element is determined by solving the Reynolds-averaged Navier-Stokes equation (RANS method). The water resistance coefficients of the tube elements are calculated at different towing speed and water depth. The comparison between numerical results and the results based on model tests proves the adopted numerical method is accurate and reliable. Therefore, the calculation method can be used to determine the water resistance coefficient of similar immersed tube elements in similar projects, and provide further guidance for the towing of the tube elements.
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