Development of a numerical model for fluid-structure interaction analysis of flow through and around an aquaculture net cage

Hao Chen*, Erik Damgaard Christensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In the present work, we developed a numerical model for fluid-structure interaction analysis of flow through and around an aquaculture net cage. The numerical model is based on the coupling between the porous media model and the lumped mass structural model. A novel interface was implemented to ensure efficient data exchange and element mapping between the fluid and structural solver via random-access memory. The main idea is to apply a static mesh in the fluid model, in case that large deformation of the net structure reduces the quality of the mesh. Then the geometry of the net cage was approximated by a set of dynamic porous zones, where the grid cells were updated at every iteration based on the transferred nodal positions from the structural model. A time stepping procedure was introduced, so the solver is applicable in both steady and unsteady conditions. In order to reduce the computational effort, sub-cycling was applied for the structural solver within each time step, based on the quasi-steady state assumption. The numerical model was validated against experiments in both steady and unsteady conditions. In general, the agreement is satisfactory.

Original languageEnglish
JournalOcean Engineering
Volume142
Pages (from-to)597-615
ISSN0029-8018
DOIs
Publication statusPublished - 2017

Keywords

  • Aquaculture net cage
  • Coupling scheme
  • Fluid-structure interaction analysis
  • Lumped mass model
  • Porous media model

Cite this

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title = "Development of a numerical model for fluid-structure interaction analysis of flow through and around an aquaculture net cage",
abstract = "In the present work, we developed a numerical model for fluid-structure interaction analysis of flow through and around an aquaculture net cage. The numerical model is based on the coupling between the porous media model and the lumped mass structural model. A novel interface was implemented to ensure efficient data exchange and element mapping between the fluid and structural solver via random-access memory. The main idea is to apply a static mesh in the fluid model, in case that large deformation of the net structure reduces the quality of the mesh. Then the geometry of the net cage was approximated by a set of dynamic porous zones, where the grid cells were updated at every iteration based on the transferred nodal positions from the structural model. A time stepping procedure was introduced, so the solver is applicable in both steady and unsteady conditions. In order to reduce the computational effort, sub-cycling was applied for the structural solver within each time step, based on the quasi-steady state assumption. The numerical model was validated against experiments in both steady and unsteady conditions. In general, the agreement is satisfactory.",
keywords = "Aquaculture net cage, Coupling scheme, Fluid-structure interaction analysis, Lumped mass model, Porous media model",
author = "Hao Chen and Christensen, {Erik Damgaard}",
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language = "English",
volume = "142",
pages = "597--615",
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Development of a numerical model for fluid-structure interaction analysis of flow through and around an aquaculture net cage. / Chen, Hao; Christensen, Erik Damgaard.

In: Ocean Engineering, Vol. 142, 2017, p. 597-615.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Development of a numerical model for fluid-structure interaction analysis of flow through and around an aquaculture net cage

AU - Chen, Hao

AU - Christensen, Erik Damgaard

PY - 2017

Y1 - 2017

N2 - In the present work, we developed a numerical model for fluid-structure interaction analysis of flow through and around an aquaculture net cage. The numerical model is based on the coupling between the porous media model and the lumped mass structural model. A novel interface was implemented to ensure efficient data exchange and element mapping between the fluid and structural solver via random-access memory. The main idea is to apply a static mesh in the fluid model, in case that large deformation of the net structure reduces the quality of the mesh. Then the geometry of the net cage was approximated by a set of dynamic porous zones, where the grid cells were updated at every iteration based on the transferred nodal positions from the structural model. A time stepping procedure was introduced, so the solver is applicable in both steady and unsteady conditions. In order to reduce the computational effort, sub-cycling was applied for the structural solver within each time step, based on the quasi-steady state assumption. The numerical model was validated against experiments in both steady and unsteady conditions. In general, the agreement is satisfactory.

AB - In the present work, we developed a numerical model for fluid-structure interaction analysis of flow through and around an aquaculture net cage. The numerical model is based on the coupling between the porous media model and the lumped mass structural model. A novel interface was implemented to ensure efficient data exchange and element mapping between the fluid and structural solver via random-access memory. The main idea is to apply a static mesh in the fluid model, in case that large deformation of the net structure reduces the quality of the mesh. Then the geometry of the net cage was approximated by a set of dynamic porous zones, where the grid cells were updated at every iteration based on the transferred nodal positions from the structural model. A time stepping procedure was introduced, so the solver is applicable in both steady and unsteady conditions. In order to reduce the computational effort, sub-cycling was applied for the structural solver within each time step, based on the quasi-steady state assumption. The numerical model was validated against experiments in both steady and unsteady conditions. In general, the agreement is satisfactory.

KW - Aquaculture net cage

KW - Coupling scheme

KW - Fluid-structure interaction analysis

KW - Lumped mass model

KW - Porous media model

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DO - 10.1016/j.oceaneng.2017.07.033

M3 - Journal article

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SP - 597

EP - 615

JO - Ocean Engineering

JF - Ocean Engineering

SN - 0029-8018

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