1 of 1 Keywords: smoothed particle hydrodynamics (SPH), discrete element method (DEM), fluid-structure interaction, scour Commissioned by: Swiss Federal Office for Water and Geology (BWG) Numerical Simulation of Sediment Transport with Meshfree Methods Numerical Simulation of Sediment Transport with Meshfree Methods Common approaches for the determination of sediment transport rates are mostly based on empirical relations. Their application is generally subject to more or less laborious and expensive calibration. Furthermore, they are not suitable to study the generally complex sediment transport processes since the empirical approaches are not able to describe the underlying physics in detail. Hence, numerous experimental investigations by various research groups using state-of-the-art measuring techniques have been carried out in the past to gain an in-depth insight into the processes involved in sediment transport. To complement the corresponding findings also numerical investigation into the subject would be desirable. However, numerical models which are able to reproduce and to resolve the involved processes are not very common, since they would have to imply the rather complex fluid-sediment interaction. In the scope of this research work, a numerical model which is based on two meshfree particle methods is presented. The fluid is modelled by a continuum approach which is discretised by the Smoothed Particle Hydrodynamics (SPH) method. The sediment particles are represented by the Discrete Element Method (DEM), where the interactions between the discrete sediment grains are modelled by a force law, which is also able to account for various kinds of friction. A similar approach is applied to the interaction between the fluid and sediment particles. The definition of the interface and the exchange of forces between the fluid and sediment grains are inherent to the applied approaches. Thus, the application of special techniques to describe a movable or deformable interface as used for grid-based methods is not necessary. Simulation of sphere settling in water tank Simulation of scour due to freefall water jet

Numerical Simulation of Sediment Transport with Meshfree ... · Commissioned by: Swiss Federal Office for Water and Geology (BWG) Numerical Simulation of Sediment Transport with Meshfree

Download PDF Report

Upload
others
View
11
Download
0

Embed Size (px)

Citation preview

Page 1: Numerical Simulation of Sediment Transport with Meshfree ... · Commissioned by: Swiss Federal Office for Water and Geology (BWG) Numerical Simulation of Sediment Transport with Meshfree

1 of 1

Keywords: smoothed particle hydrodynamics (SPH), discrete element method (DEM), fluid-structure interaction, scourCommissioned by: Swiss Federal Office for Water and Geology (BWG)

Numerical Simulation of Sediment Transport with Meshfree Methods

Common approaches for the determination of sediment transport rates are mostly based on empirical relations. Their application is generally subject to more or less laborious and expensive calibration. Furthermore, they are not suitable to study the generally complex sediment transport processes since the empirical approaches are not able to describe the underlying physics in detail. Hence, numerous experimental investigations by various research groups using state-of-the-art measuring techniques have been carried out in the past to gain an in-depth insight into the processes involved in sediment transport. To complement the corresponding findings also numerical investigation into the subject would be desirable. However, numerical models which are able to reproduce and to resolve the involved processes are not very common, since they would have to imply the rather complex fluid-sediment interaction.

In the scope of this research work, a numerical model which is based on two meshfree particle methods is presented. The fluid is modelled by a continuum approach which is discretised by the Smoothed Particle Hydrodynamics (SPH) method. The sediment particles are represented by the Discrete Element Method (DEM), where the interactions between the discrete sediment grains are modelled by a force law, which is also able to account for various kinds of friction. A similar approach is applied to the interaction between the fluid and sediment particles. The definition of the interface and the exchange of forces between the fluid and sediment grains are inherent to the applied approaches. Thus, the application of special techniques to describe a movable or deformable interface as used for grid-based methods is not necessary.

Simulation of sphere settling in water tank Simulation of scour due to freefall water jet