Abstract

The aim of this work is to be able to cope with complex sloshing-seakeeping problems in an effective manner. For this purpose, two different solvers will be integrated into one coupled tool to take advantage of their characteristics. The Particle Finite Element Method is a versatile framework for the analysis of fluid-structure interaction problems. The latest development within the framework of the PFEM is the X-IVAS (eXplicit Integration along the Velocity and Acceleration Streamlines) scheme. It is a semi-implicit scheme built over a Semi-Lagrangian (SL) formulation. This new scheme was named PFEM-2 and will be used in this work to solve the fluid dynamics (sloshing) inside the tanks. The PFEM-2 will be coupled in the time domain with SeaFEM, a solver developed for seakeeping problems. SeaFEM solves the second-order diffraction-radiation equations by using the Finite Element Method (FEM) and will be used in this work to simulate the interaction between waves and a floating body. The coupling of the two tools will be accomplished by using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. This new tool has been validated against experimental benchmarks carried out in a model basin at model scale.

Abstract

The aim of this work is to be able to cope with complex sloshing-seakeeping problems in an effective manner. For this purpose, two different solvers will be integrated into one coupled tool to take advantage of their characteristics. The Particle Finite Element Method is a versatile framework for the analysis of fluid-structure interaction problems. The latest development within the framework of the PFEM is the X-IVAS (eXplicit Integration along the Velocity and Acceleration Streamlines) scheme. It is a semi-implicit scheme built over a Semi-Lagrangian (SL) formulation. This new scheme was named PFEM-2 and will be used in this work to solve the fluid dynamics (sloshing) inside the tanks. The PFEM-2 will be coupled in the time domain with SeaFEM, a solver developed for seakeeping problems. SeaFEM solves the second-order diffraction-radiation equations by using the Finite Element Method (FEM) and will be used in this work to simulate the interaction between waves and a floating body. The coupling of the two tools will be accomplished by using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. This new tool has been validated against experimental benchmarks carried out in a model basin at model scale.

Abstract

The aim of this work is to be able to cope with complex sloshing-seakeeping problems in an effective manner. For this purpose, two different solvers will be integrated into one coupled tool to take advantage of their characteristics. The Particle Finite Element Method is a versatile framework for the analysis of fluid-structure interaction problems. The latest development within the framework of the PFEM is the X-IVAS (eXplicit Integration along the Velocity and Acceleration Streamlines) scheme. It is a semi-implicit scheme built over a Semi-Lagrangian (SL) formulation. This new scheme was named PFEM-2 and will be used in this work to solve the fluid dynamics (sloshing) inside the tanks. The PFEM-2 will be coupled in the time domain with SeaFEM, a solver developed for seakeeping problems. SeaFEM solves the second-order diffraction-radiation equations by using the Finite Element Method (FEM) and will be used in this work to simulate the interaction between waves and a floating body. The coupling of the two tools will be accomplished by using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. This new tool has been validated against experimental benchmarks carried out in a model basin at model scale.

Abstract

The aim of this work is to be able to cope with complex sloshing-seakeeping problems in an effective manner. For this purpose, two different solvers will be integrated into one coupled tool to take advantage of their characteristics. The Particle Finite Element Method is a versatile framework for the analysis of fluid-structure interaction problems. The latest development within the framework of the PFEM is the X-IVAS (eXplicit Integration along the Velocity and Acceleration Streamlines) scheme. It is a semi-implicit scheme built over a Semi-Lagrangian (SL) formulation. This new scheme was named PFEM-2 and will be used in this work to solve the fluid dynamics (sloshing) inside the tanks. The PFEM-2 will be coupled in the time domain with SeaFEM, a solver developed for seakeeping problems. SeaFEM solves the second-order diffraction-radiation equations by using the Finite Element Method (FEM) and will be used in this work to simulate the interaction between waves and a floating body. The coupling of the two tools will be accomplished by using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. This new tool has been validated against experimental benchmarks carried out in a model basin at model scale.

Abstract

There are a series of marine operations and/or navigation conditions where internal flows in tanks can affect the seakeeping behaviour of a vessel. This coupled effect must be assessed as it can be extremely important when estimating the viability of certain operations or the risks associated to specific load conditions during navigation. These operations and/or navigation conditions can be crucial in some sectors of the maritime industry where fluid-dynamic effects can improve the global dynamic response, such as anti-roll tanks used in the oil&gas industry, or can prove to be a big problem when, for example, sloshing effects appears in the transport of Liquefied Natural Gas (LNG). This presentation has two main parts. First, the recent work of the MARINE group of CIMNE in the development and application of seakeeping analysis tools will be presented. Here, we will introduce SeaFEM (see http://www.compassis.com/seafem), a second-order diffraction-radiation solver for multi-body seakeeping problems based on the Finite Element Method [1, 2]. Then, we will focus on the development and application of solutions for the coupled analysis of seakeeping problems considering internal flows in tanks, and in particular the sloshing phenomena. To estimate these critical effects, two different solvers are integrated into one coupled tool using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. Two different approaches have been implemented and validated: a) The internal flow part of the coupled problem is solved using the Smoothed Particle Hydrodynamics Method [3] (SPH) using the AQUAgpusph code developed at CEHINAV. While the interaction between waves and the floating body is solved using SeaFEM. b) The fluid dynamics part of the coupled problem is solved using the Particle Finite Element Method [4, 5] known as PFEM-2 that incorporates the X-IVAS scheme and the seakeeping problem is again solved using SeaFEM.

Abstract

There are a series of marine operations and/or navigation conditions where internal flows in tanks can affect the seakeeping behaviour of a vessel. This coupled effect must be assessed as it can be extremely important when estimating the viability of certain operations or the risks associated to specific load conditions during navigation. These operations and/or navigation conditions can be crucial in some sectors of the maritime industry where fluid-dynamic effects can improve the global dynamic response, such as anti-roll tanks used in the oil&gas industry, or can prove to be a big problem when, for example, sloshing effects appears in the transport of Liquefied Natural Gas (LNG). This presentation has two main parts. First, the recent work of the MARINE group of CIMNE in the development and application of seakeeping analysis tools will be presented. Here, we will introduce SeaFEM (see http://www.compassis.com/seafem), a second-order diffraction-radiation solver for multi-body seakeeping problems based on the Finite Element Method [1, 2]. Then, we will focus on the development and application of solutions for the coupled analysis of seakeeping problems considering internal flows in tanks, and in particular the sloshing phenomena. To estimate these critical effects, two different solvers are integrated into one coupled tool using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. Two different approaches have been implemented and validated: a) The internal flow part of the coupled problem is solved using the Smoothed Particle Hydrodynamics Method [3] (SPH) using the AQUAgpusph code developed at CEHINAV. While the interaction between waves and the floating body is solved using SeaFEM. b) The fluid dynamics part of the coupled problem is solved using the Particle Finite Element Method [4, 5] known as PFEM-2 that incorporates the X-IVAS scheme and the seakeeping problem is again solved using SeaFEM.

Abstract

There are a series of marine operations and/or navigation conditions where internal flows in tanks can affect the seakeeping behaviour of a vessel. This coupled effect must be assessed as it can be extremely important when estimating the viability of certain operations or the risks associated to specific load conditions during navigation. These operations and/or navigation conditions can be crucial in some sectors of the maritime industry where fluid-dynamic effects can improve the global dynamic response, such as anti-roll tanks used in the oil&gas industry, or can prove to be a big problem when, for example, sloshing effects appears in the transport of Liquefied Natural Gas (LNG). This presentation has two main parts. First, the recent work of the MARINE group of CIMNE in the development and application of seakeeping analysis tools will be presented. Here, we will introduce SeaFEM (see http://www.compassis.com/seafem), a second-order diffraction-radiation solver for multi-body seakeeping problems based on the Finite Element Method [1, 2]. Then, we will focus on the development and application of solutions for the coupled analysis of seakeeping problems considering internal flows in tanks, and in particular the sloshing phenomena. To estimate these critical effects, two different solvers are integrated into one coupled tool using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. Two different approaches have been implemented and validated:     a) The internal flow part of the coupled problem is solved using the Smoothed Particle Hydrodynamics Method [3] (SPH) using the AQUAgpusph code developed at CEHINAV. While the interaction between waves and the floating body is solved using SeaFEM.     b) The fluid dynamics part of the coupled problem is solved using the Particle Finite Element Method [4, 5] known as PFEM-2 that incorporates the X-IVAS scheme and the seakeeping problem is again solved using SeaFEM.

Abstract

There are a series of marine operations and/or navigation conditions where internal flows in tanks can affect the seakeeping behaviour of a vessel. This coupled effect must be assessed as it can be extremely important when estimating the viability of certain operations or the risks associated to specific load conditions during navigation. These operations and/or navigation conditions can be crucial in some sectors of the maritime industry where fluid-dynamic effects can improve the global dynamic response, such as anti-roll tanks used in the oil&gas industry, or can prove to be a big problem when, for example, sloshing effects appears in the transport of Liquefied Natural Gas (LNG). This presentation has two main parts. First, the recent work of the MARINE group of CIMNE in the development and application of seakeeping analysis tools will be presented. Here, we will introduce SeaFEM (see http://www.compassis.com/seafem), a second-order diffraction-radiation solver for multi-body seakeeping problems based on the Finite Element Method [1, 2]. Then, we will focus on the development and application of solutions for the coupled analysis of seakeeping problems considering internal flows in tanks, and in particular the sloshing phenomena. To estimate these critical effects, two different solvers are integrated into one coupled tool using an effective coupling algorithm and a communication technique that allows simulations to be computed without affecting the global compute time and the accuracy of the solvers. Two different approaches have been implemented and validated: a) The internal flow part of the coupled problem is solved using the Smoothed Particle Hydrodynamics Method [3] (SPH) using the AQUAgpusph code developed at CEHINAV. While the interaction between waves and the floating body is solved using SeaFEM. b) The fluid dynamics part of the coupled problem is solved using the Particle Finite Element Method [4, 5] known as PFEM-2 that incorporates the X-IVAS scheme and the seakeeping problem is again solved using SeaFEM.