A Lagrangian approach for the coupled simulation of fixed net structures in a Eulerian fluid model

Martín, Tobías; Kamath, Arun; Bihs, Hans

doi:10.1016/j.jfluidstructs.2020.102962

Cited by 46 publications

(39 citation statements)

References 33 publications

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“…A two-way coupled approach between fluid and net is enabled by calculating the forces on the net using the solution of the fluid dynamics and including the influence of the net on the fluid in the fluid equations. The forcing strategy developed in [8] is utilised to enforce the boundary conditions at the fluid-net interface. Here, the forcing term S in ( 2) is defined such that it represents the momentum loss of the fluid while passing the net.…”

Section: Simulation-based Screen Force Modelmentioning

confidence: 99%

“…with l the length and d the diameter of the twines. In [8], the drag and lift coefficients are approximated from the analytically derived Fourier series in [15] and fitting of the free coefficients to experimental data. This approach could be validated successfully but at the same time, shortcomings were highlighted.…”

Section: Simulation-based Screen Force Modelmentioning

confidence: 99%

“…This kind of approximation is necessary due to the large length scale difference between the twines of a net and the size of the complete structure, which prevents the resolution of the net on the same numerical grid as the fluid domain. The limitations of the porous medium approach were overcome in [8] by including an additional source term in the Navier-Stokes equations. The model was successfully validated for rigid [8] and flexible [9] net sheets and cages, as well as complete OOA structures [10].…”

Section: Introductionmentioning

confidence: 99%

“…The limitations of the porous medium approach were overcome in [8] by including an additional source term in the Navier-Stokes equations. The model was successfully validated for rigid [8] and flexible [9] net sheets and cages, as well as complete OOA structures [10].…”

Section: Introductionmentioning

confidence: 99%

“…The additional coefficients arising from their model were not finally fixed. Recently, they were fitted to existing experimental data [8], and the resulting screen force model was successfully applied for CFD simulations. However, the authors highlighted multiple shortcomings of this approach.…”

Section: Introductionmentioning

confidence: 99%

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Modelling Open Ocean Aquaculture Structures Using CFD and a Simulation-Based Screen Force Model

Martín

Kamath

Wang

et al. 2022

JMSE

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The numerical framework of the open source CFD solver REEF3D is utilised to study the fluid–structure interaction of an open ocean aquaculture system and waves. The presence of the net is considered in the momentum equations of the fluid using a forcing term based on Lagrangian–Eulerian coupling and the hydrodynamic loads on the net. They are defined semi-empirically using a screen force model. Here, the hydrodynamic force coefficients are calculated from the net geometry and fluid velocity. The necessary force coefficients are predicted from a new simulation-based screen force model. Here, CFD simulations are performed to obtain the hydrodynamic loads on net panels for varying net geometries, angles of attack and velocities. Then, a Kriging metamodel is applied to fit a polynomial to the data. The proposed net model is validated against measurements for waves and current through rigid net panels and applied to simulate the dynamics of an open ocean aquaculture cage in waves. In current, the model predicts the drag forces and velocity reduction within a 10% error band, whereas it tends to under-predict the lift forces by up to 20%. In waves, the model tends to over-predict the crests with increasing wave height, but the deviations are also within a 10% error band.

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Section: Simulation-based Screen Force Modelmentioning

confidence: 99%

Section: Simulation-based Screen Force Modelmentioning

confidence: 99%