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Readme file for DWRDrag

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======================================== MATLAB (GNU Octave) package codes:

This package contains four files:

• "example_script_DWR.m": is an example of a script that calls postprocessingDWR_ll
• "postprocessingDWR_ll.m": is the main function and calculates the rheological properties from amplitude ratio and phase lag experimental data of a rotational rheometer with a DWR fixture.
• "solve_NS_DWR_ll.m": is a function that solves the Navier-Stokes equations with no-slip and Boussinesq_Scriven boundary conditions with second order centered finite differences for the DWR configuration.
• "GetFilenames.m": is a function that returns a cell array with the names of the files having the specific pattern contained in the specified filepath.

REQUIREMENTS:

Check that MATLAB (or GNU Octave) is installed on your computer. You can download the latest released version of GNU Octave for your operating system from: https://www.gnu.org/software/octave/download or https://ftp.gnu.org/gnu/octave/.

EXECUTION:

1. All subroutines and files must be in the Current Folder or in a folder contained in the MATLAB Search Path.
2. Configure parameters in your_script_file by editing "example_script_DWR.m" and changing the input parameters.
3. Execute the script file as follows:
   • On MATLAB GUI (or Octave GUI) version:
     • type on Command Window: run your_script_file.
     • open your_script_file.m on the editor and click run (or press F5)
   • On command line open cmd (Windows) or Terminal (Linux and OS X) and type:
     • matlab -r your_script_file.
     • octave your_script_file.

======================================== Python3 package codes:

This package contains two files:

• "example_script_DWR.py" : is an example of a script that calls postprocessingDWR_ll contained in DWRfuns module.
• "DWRfuns.py": a module that contains the definition of solve_NS_DWR_ll and postprocessingDWR_ll functions.

REQUIREMENTS:

Check that Python3 with numpy and scipy modules is installed on your computer. You can download all versions of Python for your operating system from: https://www.python.org/downloads/.

EXECUTION:

1. All subroutines must be in the current folder or in a folder contained in the system path.
2. Configure parameters in your_script_file by editing example_script_DWR.py and changing the input parameters.
3. Execute the script file: open cmd (Windows) or Terminal (Linux and OS X) and type: python your_script_file.

TESTING THE PACKAGE:

You can use "test_exp.txt" as an experiment file for testing the package by executing the original example_script_DWR. This experiment file has been generated using a viscous interface \eta_s^* = \eta_s' with modulus |\eta_s^*| varying from 1e-7 to 1 in 30 logarithmically spaced steps.