Swan#

SWAN is a third-generation wave model for obtaining realistic estimates of wave parameters in coastal areas, lakes and estuaries from given wind, bottom and current conditions. The model is based on the wave action balance equation with sources and sinks. SWAN allows to use two types of grids (structured and unstructured) and nesting approach. SWAN is not recommended to use in on ocean scales.

Manual can be found here and more about SWAN settings can be found here.

Quickstart#

Load the module
Text Only
```
module load green/all
module load Swan
```

Copy the examples

Text Only

cp -r $SWANDIR/../Examples Swan-examples

Unpack one example

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cd Swan-examples
tar xf refrac.tar.gz
cd refrac

Download the swan.slurm script

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curl https://docs.hpc.taltech.ee/engineering/swan.slurm

Adjust ntasks, nodes and cpus-per-task submit it:

Text Only

sbatch swan.slurm

Contents of the swan.slurm:

Bash

#!/bin/bash
#SBATCH --partition=green-ib  ### Partition
#SBATCH --job-name=Swan   ### Job Name           -J
#SBATCH --time=00:10:00       ### WallTime           -t
#SBATCH --nodes=1             ### Number of Nodes    -N 
#SBATCH --ntasks-per-node=2   ### Number of tasks (MPI processes)
#SBATCH --cpus-per-task=4     ### Number of threads per task (OMP threads)
#SBATCH --mem-per-cpu=100     ### Min RAM required in MB

#set up enviroment    
module load green/all
module load Swan

export OMP_NUM_THREADS=$SLURM_CPUS_PER_TASK        
MACHINEFILE="machinefile"

# Generate Machinefile for mpi such that hosts are in the same order as if run via srun
srun -l /bin/hostname | sort -n | awk '{print $2}' > $MACHINEFILE

# do the swan simulation
swanrun -input a11refr.swn -mpi $SLURM_NTASKS -omp=$SLURM_CPUS_PER_TASK

#rm $MACHINEFILE