Smoothed Particle Hydrodynamics for Free-Surface Flows - Selected Topics of Computational and Experimental Fluid Mechanics - page 127

4.1 Wave Propagation

DualPSHysics is suitable to study the wave propagation in the vicinity of the coast
where the real bathymetry and topography of the shoreline is given. In this first case,
large waves approach the shore and impact with a steep coast. On the other hand,
any 3D external model with the complex geometry of a protection structure or a
promenade can be included in the simulation since these geometries can be easily
converted into fixed boundary SPH particles to interact with.
The SPH parameters corresponding to this simulation are shown in Table 3 .This
simulationwas executed in 32 TeslaM2090 (hosted at Minotauro cluster at Barcelona
Supercomputing Center, BSC). The multi-GPU parallelisation allows the simulation
of very large domains in a reasonable time or to run cases that will not fit in a unique
GPU card due to the memory usage.
Different instants of the simulation using DualSPHysics are illustrated in Fig. 5 .

4.2 Wave Interaction with a Fixed Complex Structure

In the second case, the importance of the numerical resolution is highlighted.
This application consists of the interaction of a large wave with a fixed oil rig
using realistic dimensions. The domain size is 172

55m and the struc-
ture includes items with a spatial scale on the order of a few centimetres. Hence, a
huge number of particles is required to represent the objects of small size in the oil
platform.
As in the previous case, the simulation was performed using 64 GPUs at the BSC
facilities and 1 billion particles were simulated (one of the largest simulations with
a meshfree model in the field of fluid dynamics). All parameters are summarised in
Table 4 , and Fig. 6 shows different instants of the simulation with DualSPHysics.

× 116 ×

Ta b l e 3 Parameters of the
wave propagation case

Parameter Va l u e

Kernel function Wendland

Time-step algorithm Symplectic

Viscosity treatment Artificial viscosity with ʱ = 0 . 1

Interparticle distance 0.1m

Total number of particles 265 million particles

Physical time 50 s

Computation time 246.3h

Execution device 32 × Tesla M2090