Bastr - A parallel solver for 2D/3D Burgers turbulence

This code is adapted from astr code - it keeps its parallel framework. However, the calculation process is of no relation with the astr code: we use a pseudo-spectral method.

Run

Launch script: mpirun -np $CORENB $ASTR_DIR/bin/Bastr

Input

The input file should contail two files:

1. An initial flow field datin/flowini2d.h5 or datin/flowini3d.h5, generated from pp(postprocess) module of astr or Bastr, containing flow field of u1, u2 and u3(for 3D)

2. An datin/input.dat file with following format:

########################################################################
#                     input file of BASTR code                          #
########################################################################

# ia,ja,ka: The size of grid. All non-zero--3D mode; ka=0--the 2d mode 
2048,2048,0

# ref_t,reynolds: Reference variables for viscosity
273.15d0, 5000.d0

# maxstep,deltat,lwsequ,feqwsequ,lwspectra,feqwspe, kmax: output configurations
2000, 1.d-4, t, 2000, t, 200, 200

# forcemethod, forcek, targetenergy, lproject: Forcing and calculation
2,5,0.075d0,t

List of parameters:

• maxstep : Maximum running step
• deltat : $\Delta t$ of each step
• lwsequ : t/f to open sequential output
• feqwsequ : frequency(nstep) of sequential output
• lwspectra : t/f to open spectral output
• feqwspe : frequency(nstep) of spectral output
• kmax : maximum k for spectral output
• forcemethod : 0 = free decaying, 1 = linear forcing, 2 = forcing on a band, 3 =
• forcek : valable only if ....TODO
• targetenergy : valable only if forcemethod on
• lproject : only project to dilatational part

Pre & Post Process (pp)

Launch script: mpirun -np $CORENB $ASTR_DIR/bin/Bastrpp $MODULENAME $PARAMETERS

Initial field add

$MODULENAME = addfield2d

Transfer calculation

$MODULENAME = transfer2d. require parameter: flow field number

Dependencies

This code requires a dependency on

• mpi (e.g. mpich or openmpi or any thing you like)
• hdf5 (A guide for hdf5 installation is below)

tar -zxvf hdf5-1.14.4-3.tar.gz # Or other files
cd hdf5-1.14.4-3/

# Load your mpi and fortran compilers, e.g.
module purge
module load compiler/devtoolset/7.3.1
module load mpi/hpcx/2.7.4/gcc-7.3.1
module load compiler/intel/2020.1.217

# Configuration and compile
./configure --enable-parallel --enable-fortran CC=mpicc CXX=mpic++ FC=mpif90 F90=mpif90 --enable-build-mode=production --enable-build-mode=debug --enable-shared
make
make check
make install

• fftw

Installation procedure

1. Equip your computer with above libraries (If your computer is already equipped with ASTR code? - Feel free! It is also adapted for Bastr)
2. Just run make and you can compile the Bastr code.