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#!/bin/bash
# run_case.sh — 运行单个 OpenFOAM interFoam case
# 用法: bash run_case.sh <case_dir> [n_procs]
# 参数:
#   case_dir  — OpenFOAM case 根目录(包含 0/, constant/, system/, Allrun)
#   n_procs   — MPI 并行进程数(默认 4)
#
# 流程: blockMesh → decomposePar → mpirun interFoam → reconstructPar
# 错误检查: 每步检查返回码,失败立即退出

# 注意: 不使用 set -e,由调用方根据返回码判断成功/失败
set -uo pipefail

CASE_DIR="${1:?用法: bash run_case.sh <case_dir> [n_procs]}"
N_PROCS="${2:-4}"

# 验证 case 目录存在且包含必要文件
for f in Allrun constant/transportProperties system/blockMeshDict; do
    if [ ! -f "$CASE_DIR/$f" ]; then
        echo "ERROR: 缺少必要文件 $CASE_DIR/$f"
        exit 1
    fi
done

echo "=========================================="
echo "运行 case: $CASE_DIR"
echo "并行进程数: $N_PROCS"
echo "=========================================="

cd "$CASE_DIR"

# Allrun 脚本处理 blockMesh → decomposePar → interFoam → reconstructPar
# 使用 ./Allrun 而非 bash Allrun,确保 ${0%/*} 正确解析为当前目录
./Allrun "$N_PROCS"

echo "=========================================="
echo "case 完成: $CASE_DIR"
echo "=========================================="