a short script for taking mesa input and preparing it for the grsolver

scripts/python/grsolver/read_MESA_for_grsolver.py

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+#!/usr/bin/env python3
+
+"""
+This script retrieves raw MESA profile data variables, reverses them to be center to surface, and outputs them in the format needed for GRSOLVER for use in Phoebus.
+
+Usage:
+    python read_MESA_for_grsolver.py --file='20m_cc' --ext='.dat'
+
+Arguments:
+    input_file: filename and file extension of MESA profile
+"""
+
+import numpy as np
+import pandas as pd
+from argparse import ArgumentParser
+
+
+def load(file, ext):
+    df = pd.read_csv(file + ext, sep=r"\s+", header=4)
+    df = df.iloc[::-1].reset_index(drop=True)
+    nzones = len(df)
+    if nzones > 0:
+        print("loaded file:", file + ext, " with ", nzones, " zones.")
+    else:
+        print("failed to load file", file + ext)
+        exit()
+    return df
+
+
+def retrieve_and_save(df, file):
+    radius = df["radius_cm"]
+    velocity = df["velocity"]
+    # if model non-rotating, pass array of zeros
+    try:
+        angular_velocity = df["omega"]
+    except:
+        angular_velocity = np.zeros_like((radius))
+    density = df["density"]  # g/cm^3
+    pressure = df["pressure"]  # g/cm^3
+    ye = df["ye"]
+    temperature = df["temperature"]  # K
+    sie = df["energy"]  #  ! internal energy (ergs/g)
+
+    np.savetxt(
+        file + str("_raw_data.txt"),
+        np.column_stack(
+            [
+                radius,
+                velocity,
+                angular_velocity,
+                density,
+                pressure,
+                ye,
+                temperature,
+                sie,
+            ]
+        ),
+        header="MESA output from model `" + str(file) + "` | \ "
+        "radius (cm) velocity (cm/s) angular_velocity (rad/s)  density (g/cm^3) pressure (dyne/cm^2) ye temperature (K) specific internal energy (erg/g)",
+    )
+    return
+
+
+def main():
+    parser = ArgumentParser(
+        description="Retrieve raw MESA profile data variables and output to format needed for GRSOLVER for use in Phoebus."
+    )
+
+    parser.add_argument(
+        "--file",
+        type=str,
+        default="file",
+        help="name of the input MESA file without extension",
+    )
+
+    parser.add_argument(
+        "--ext",
+        type=str,
+        default=".dat",
+        help="input MESA file extension",
+    )
+
+    args = parser.parse_args()
+    print(args.file, args.ext)
+    df = load(args.file, args.ext)
+    retrieve_and_save(df, args.file)
+
+    return
+
+
+if __name__ == "__main__":
+    main()