difad_mod.f

31 lines · 1 definitions · on GitHub (7be4133)

Python version: difad_mod.py, 19 lines, on the right (switch to Python above the code).

Variables on this page (3)

ecod3, ecod4, json

Purpose

DIFAD_MOD holds the advective and diffusive coefficients of angular momentum transport on the even grid, used when transport is treated as diffusion plus advection (LDIFAD), shared by 4 routines. It replaces COMMON/DIFAD/ (MHP via Claude, 10/14/26); JSON comes from DIMENSIONS_MOD.

What its variables hold, who sets them, who reads them.

ECOD3(JSON), ECOD4(JSON): the advective and diffusive coefficients. ROTGRID interpolates them onto the even grid from VESA, VESD (DIFAD2_MOD), adds the composition diffusion coefficient to ECOD4 and rescales both; DADCOEFT recomputes them in its iterations and builds its band matrix from them; DCOEFT reads them; CHECKJ prints them.

Design

A blanket USE DIFAD_MOD.

Definitions

moduleDIFAD_MOD

lines 19–31 · GitHub

Uses modules DIMENSIONS_MOD

Used by (4 units)

CHECKJ, DADCOEFT, DCOEFT, ROTGRID

Change log

The changes since rp_1

Changed since rp_1. New file: COMMON/DIFAD/ as a module.

1C 2C 3C$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ 4C DIFAD_MOD 5C$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ 6C 10/14/26 MHP via Claude 7C code changed to convert COMMON/DIFAD/ into this module. 8C 9C Imported with a blanket USE, the convention for the conversion. 10C All 4 files declared this block identically, so the USE 11C imports exactly the names the declaration already made global in 12C each scoping unit and cannot change meaning. 13C 14C The types restate what the implicit rules supplied: L is 15C LOGICAL*4, I/J/K/M/N are INTEGER*4, everything else REAL*8. 16C SAVE is explicit rather than relying on module variables being 17C implicitly saved, which holds only from Fortran 2008 while ifort 18C Classic predates it. That matches COMMON's semantics. 19 MODULE DIFAD_MOD 20C 10/20/26 MHP via Claude 21C code changed to take JSON from DIMENSIONS_MOD instead of declaring 22C a PRIVATE copy here. 23 USE DIMENSIONS_MOD 24 25 IMPLICIT NONE 26 SAVE 27 28 REAL*8 :: ECOD3(JSON) 29 REAL*8 :: ECOD4(JSON) 30 31 END MODULE DIFAD_MOD

1"""Python version of difad_mod.f (YREC 7be4133): the advective and diffusive 2coefficients of angular momentum transport on the even grid, formerly 3COMMON/DIFAD/. 4 5Translates: difad_mod.f#DIFAD_MOD (7be4133) 6 7Routines that USE DIFAD_MOD import this module and write 8``difad_mod.<name>``. 9""" 10 11import numpy as np 12 13from pyrec import dimensions_mod 14 15_JSON = dimensions_mod.json 16 17# Fortran lines 28–29. 18ecod3 = np.zeros(_JSON + 1) # advective coefficient (rotgrid, dadcoeft) 19ecod4 = np.zeros(_JSON + 1) # diffusive coefficient (rotgrid, dadcoeft)