Subsea manifold installation: Operational windows estimation based on hydrodynamic model testing

Nonlinear dynamics of deep water subsea lifting operations considering KC-dependent hydrodynamic coefficients

“…Experimental data for KC-dependent added mass and drag coefficients of typical subsea manifolds were presented by Pestana et al (2021). In their study, 1:35 scale models were used to perform oscillatory tests in a calm fluid for various KC = 2𝜋𝑊/𝐷, where 𝑊 is the amplitude of the oscillation and 𝐷 is the characteristic length of the body (i.e.…”

“…The base plate of the manifold presents some small perforations, but they are less than 5% of the total vertical projected area. Further details of the experimental set-up and methodology can be found in Pestana et al (2021).…”

“…To the best knowledge of the authors, the only studies considering the influence of the amplitude of oscillation on the dynamics of the system are due to Ireland et al (2007) and Pestana et al (2021). In the study by Ireland et al (2007), only the hydrodynamic damping was considered variable and the solution of the equation of motion was obtained iteratively.…”

“…In the study by Ireland et al (2007), only the hydrodynamic damping was considered variable and the solution of the equation of motion was obtained iteratively. While in Pestana et al (2021), the dynamics of an example operation were assessed by running independent simulations considering all the pairs of added mass and drag coefficients obtained experimentally for different KC numbers. Therefore, the objective of this work is to extend the study about the dynamics of subsea lifting operations in deep waters considering the effects of KC-dependent hydrodynamic coefficients, focusing on (1) the deduction of a non-dimensional nonlinear equation of motion for the system; (2) solution of the equation of motion by the harmonic balance method and by an iterative time domain integration algorithm; and (3) illustration of the dynamical features of the system when the hydrodynamic coefficients are KC-dependent.…”

CFD Estimation of a Resistance Coefficient for an Egg-Shaped Geometric Dome

“…Liang et al applied the finite difference method to estimate the drag force and drag coefficient [11]. In other attempts, [12,13] performed a CFD analysis and got a good agreement between numerical and experimental results. In a similar case to this study topic, Cheng et al in [14] showed that the drag coefficient of an elliptical section is 51.3% smaller than for a circular section using the finite volume method.…”