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=== Python Ocean Model (pyOM) === ## page was renamed from TO/pyOM
'''Python Ocean Model (pyOM)'''
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A numerical Ocean Circulation Model  to configure and to integrate idealized numerical simulations with an easy to use python (GUI) and a standard Fortran90 frontend. A numerical Ocean Circulation Model to configure and to integrate idealized numerical simulations with python (GUI) and a standard Fortran90 frontend.
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 * Neglecting of thermodynamic equation  * Fully incompressible thermodynamics
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=== Installation ===
1. Make a new directory where the model code should be placed. Name the directory as dir(for instance)		 === Installation (only for students of UHH) ===
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2. Get into the remote server thunder1 (Only for students in UHH) 1. Login at the remote server thunder1
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3. Once you log in, find u241155 (Prof. Eden directory)
2. Once you logged in, make a new directory where the model code should be placed. Name the directory as dir (for instance)


3. Find home directory of u241155
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and copy this directory to your new directory to get src file for compiling. and copy the following directory to your new directory to get src files for compiling
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cp home/zmaw/u241155/pyOM_thunder cp home/zmaw/u241155/pyOM_thunder <dir>
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4. Then, by different Fortran subroutines and Python methods in the model configuration
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environments in specific realizations can be shown. 4. Now all model code and Fortran subroutines and Python methods for the model configuration can be found in <dir>
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List of Directories List of Directories in <dir>
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== Model configurations: ==
'''This routine/method is called only once before allocating the model variables. '''		 == Model Configurations ==
'''Allocating the model variables'''
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* ''set_parameter'' :sets all important fixed model parameter * set_parameter :sets all important fixed model parameter
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'''This routine/method is only called once during the model setup. ''' '''In the model setup'''
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'''This routine/method is called for each time step. ''' '''For each time step'''
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=== Kelvin-Helmholtz Instabilities More === === Kelvin-Helmholtz Instability ===
[[https://wiki.zmaw.de/ifm/TO/pyOM/Kelvin-Helmholtz%20Instability|Content Here]]
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=== Rayleigh–Bénard Convection ===
[[https://wiki.zmaw.de/ifm/TO/pyOM/Rayleigh–Bénard%20Convection|Content Here]]

{{{
rayleigh.py
}}}
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[[https://wiki.zmaw.de/ifm/TO/pyOM/Rayleigh–Bénard%20Convection|Content Here]]
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[[https://wiki.zmaw.de/ifm/TO/pyOM/Eddy-driven%20Zonal%20Jets|Content Here]]
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[[https://wiki.zmaw.de/ifm/TO/pyOM/Thermohaline%20Circulation|Content Here]]
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=== Meridional Overturning Circulation === === Southern Ocean Circulation ===
[[https://wiki.zmaw.de/ifm/TO/pyOM/Southern%20Ocean%20Circulation|Content Here]]
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[[https://wiki.zmaw.de/ifm/TO/pyOM/ENSO%20Response|Content Here]]
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=== Equatorial Wave === === Equatorial Waves ===
[[https://wiki.zmaw.de/ifm/TO/pyOM/Equatorial%20Waves|Content Here]]
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=== Significant Wave Height (Rayleigh distribution) ===
{{{
rayleigh.py
}}}
=== Isopycnal Diffusion Problem ===		 === Isopycnal Diffusion ===
[[https://wiki.zmaw.de/ifm/TO/pyOM/Isopycnal%20Diffusion|Content Here]]
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== //pyOM (Python Ocean Model) ==
is a numerical ocean circulation model with an easy to use python (GUI) and a standard

Fortran90 frontend. In both cases, the dynamical core of the model is written in Fortran90.

Some features are

 * surface pressure or implicit linear free surface formulation
 * nonhydrostatic version
 * 1D domain decomposition for parallel computation
 * Documentation available as [[attachment:pyOM.pdf|pdf file]]
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Source code [[attachment:pyOM_1.1.tar.gz]]

Python Ocean Model (pyOM)

Contents

  1. Introduction
    1. Features
    2. Assumptions and Approximations
    3. Resources
  2. Prerequisites and Installation
    1. Prerequisites
    2. Installation (only for students of UHH)
  3. Model Configurations
  4. Sample Configurations
    1. Kelvin-Helmholtz Instability
    2. Rayleigh–Bénard Convection
    3. Eady's Baroclinic Instability
    4. Eddy-driven zonal jets
    5. Thermohaline Circulation
    6. Southern Ocean Circulation
    7. ENSO Response
    8. Equatorial Waves
    9. Isopycnal Diffusion

Introduction

A numerical Ocean Circulation Model to configure and to integrate idealized numerical simulations with python (GUI) and a standard Fortran90 frontend.

In both cases, the dynamical core of the model is written in Fortran90.

Features

  • Surface pressure or implicit linear free surface formulation
  • Non-hydrostatic version
  • 1D domain decomposition for parallel computation

Assumptions and Approximations

  • Fully incompressible thermodynamics
  • Boussinesq approximation
    • ( Volume conservation and Buoyancy perturbations in gravity term)
  • Cartesian and beta-plane approximation

Resources

  • Model Manual Here

  • Ocean Model Source Code Here

Prerequisites and Installation

Prerequisites

1. Unix system

2. Fortran 90 compiler

3. Fortran and Python front ends NetCDF-library

Installation (only for students of UHH)

1. Login at the remote server thunder1 

ssh thunder1

2. Once you logged in, make a new directory where the model code should be placed. Name the directory as dir (for instance)

3. Find home directory of u241155 

finger u241155

and copy the following directory to your new directory to get src files for compiling 

cp home/zmaw/u241155/pyOM_thunder <dir>

4. Now all model code and Fortran subroutines and Python methods for the model configuration can be found in <dir>

List of Directories in <dir>

* ./for_src: Fortran subroutines used by both Fortran and Python front end

* ./py_src: Python modules and extension modules

* ./py_config: Configuration examples of Python front end

* ./for_config: Configuration examples for Fortran front end

* ./doc: contains documentation

* ./bin: contains executable of Fortran front end after successful compilation

Model Configurations

Allocating the model variables

* set_parameter :sets all important fixed model parameter

In the model setup

* set_coriolis : sets the (vertical and horizontal) Coriolis parameter.

* initial_conditions :sets the initial conditions.

* topography : set the topography.

For each time step

* boundary_conditions : set the surface boundary conditions.

* restoring_zones : set the interior sources and sinks for density.

* momentum_restoring_zones : set the interior sources and sinks for momentum.

* tracer_sources : set interior sources and sinks for the passive tracer. Also sets the surface boundary conditions.

Sample Configurations

Kelvin-Helmholtz Instability

Content Here 

kelvin_helm1.py

Rayleigh–Bénard Convection

Content Here 

rayleigh.py

Eady's Baroclinic Instability

Content Here 

eady1.py / eady2.py

Eddy-driven zonal jets

Content Here 

jets1.py

Thermohaline Circulation

Content Here 

THC1.py

Southern Ocean Circulation

Content Here 

acc1.py

ENSO Response

Content Here 

enso1.py

Equatorial Waves

Content Here 

eq_waves1.py

Isopycnal Diffusion

Content Here 

isopyc_test1.py

An example of the python GUI for Eady's baroclinic instability case is shown below.

pyOM.png

IfmWiki: TO/outdated/pyOM (last edited 2014-09-13 14:56:24 by CarstenEden)