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CLAUDE.md

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CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

Initial condition generator for drop/bubble contact line simulations using Basilisk CFD. Creates smooth interface geometries for a drop/bubble touching a flat wall with a fillet transition at the contact point.

Build Commands

Compile the Basilisk C code:

qcc -O2 -Wall InitialCondition.c -o InitialCondition -lm

Run the Python generator:

python generate_initial_condition.py --delta 0.01
python generate_initial_condition.py --delta 0.01 --images
python generate_initial_condition.py --delta 0.01 --images --basilisk --L0 3

Architecture

Workflow

  1. Python (CLI/Jupyter): Generates interface coordinates using get_circles(delta)
  2. Data file: Coordinates saved to f_Testing.dat (space-separated x,y pairs)
  3. Basilisk C: InitialCondition.c reads the data file and creates volume fraction field

Key Parameters

  • delta: Neck radius / minimum length scale (separation = 2*delta)

Geometry Construction

The interface consists of three connected segments:

  1. Circle 1 (orange): Main drop, radius 1, centered at (-(1+delta), 0)
  2. Fillet circle (red): Smooth transition at contact, computed radius Rf
  3. Vertical line (blue): Wall contact extending upward from fillet

Output Structure

DataFiles_delta{value}/
  f_init.dat           # Interface: circle + fillet + vertical line
  f-drop_init.dat      # Full drop circle (for filling)

ImageFiles_delta{value}/
  TestWithoutBasilisk.pdf    # Pure geometry visualization
  TestWithBasilisk.pdf       # Comparison with Basilisk facets

f_Testing.dat          # Working file for Basilisk input (root, gitignored)
f_facets.dat           # Basilisk facets output (root, gitignored)

Python Dependencies

numpy, matplotlib, pandas

Requires LaTeX for plot labels (plt.rc('text', usetex=True)).

Basilisk Headers

#include "axi.h"           // Axisymmetric coordinates
#include "fractions.h"     // Volume fraction computation
#include "distance.h"      // Signed distance function
#include "navier-stokes/centered.h"

File Descriptions

  • generate_initial_condition.py: CLI script for batch generation
  • InitialCondition.ipynb: Interactive notebook for development
  • InitialCondition.c: Basilisk C code for CFD validation
  • DataFiles_delta*/: Organized data outputs by delta value
  • ImageFiles_delta*/: Organized image outputs by delta value