This page contains a guide to the building and running a Single-Column Model (SCM), which is derived from OpenIFS 48r1.
Installing OpenIFS and the SCM
In order to build the SCM from OpenIFS it is necessary to install OpenIFS. If you have not installed or built OpenIFS before To install the SCM at OpenIFS 48r1 (and beyond) it is first necessary to download and extract the tarball containing the model source package for OpenIFS. Instructions about how to do this can be found OpenIFS 48r1 GettingStarted page, section Extract the OpenIFS package.
Download and extraction of the OpenIFS 48r1 sources tarball is only required if a user has not previously done this for a general OpenIFS install.
If a user has already downloaded the OpenIFS package to install the 3D model, there is no need to extract the package again, since the SCM is packaged with OpenIFS.
Building and testing the SCM
The SCM can be built by following the instructions described OpenIFS 48r1 GettingStarted - Build OpenIFS. As described, these instructions will build, by default, both the OpenIFS executables for a 3D global simulation and the SCM executables. This step will also run a standard test to check that the SCM will run on the chosen system
Running the SCM
Before the SCM can be run, it is necessary to obtain and extract the SCM test-case package. In a similar fashion to the OpenIFS package and the experiment data, the SCM test-case package can be download from https://sites.ecmwf.int/openifs/openifs-data/scm/48r1/scm_openifs_48r1.1.tar.gz. Please note that access to this web site is restricted to registered OpenIFS users, i.e. your personal ECMWF account must have been added to the OpenIFS user policy.
In the example below we assume that the SCM package shall be installed in the user's HOME directory, and that the wget utility is available for convenient download:
cd $HOME wget https://sites.ecmwf.int/openifs/openifs-data/scm/48r1/scm_openifs_48r1.1.tar.gz tar -xvzf scm_openifs_48r1.tar.gz
The untarred SCM package is small, ~45 Mb and data produced by a standard individual SCM simulation is also low. However, if I user is planning to perform many simulations and store the data, which is often the case, the disk space usage can become large. If this is the plan, then a user may need to consider installing the SCM test-case package on a larger disk area than HOME.