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raw/droplet_impact/t09/constant/transportProperties

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      transportProperties;
+}
+
+// 液滴撞击算例物性参数
+// 参考: Pasandideh-Fard, M. et al. (1996). "Capillary effects during
+//       droplet impact on a solid surface." Phys. Fluids, 8(3), 650-659.
+// 水滴撞击固体壁面，We≈69, Re≈3360
+
+phases (water air);
+
+water
+{
+    transportModel  Newtonian;
+    nu              1.005e-06;  // 运动粘度 [m^2/s] (μ=1.003e-3 Pa·s / ρ=998 kg/m^3)
+    rho             998;        // 密度 [kg/m^3] (20 deg C)
+}
+
+air
+{
+    transportModel  Newtonian;
+    nu              1.455e-05;  // 运动粘度 [m^2/s] (μ=1.78e-5 Pa·s / ρ=1.225 kg/m^3)
+    rho             1.225;      // 密度 [kg/m^3]
+}
+
+sigma           0.0728;         // 表面张力系数 [N/m] (水-空气, 20 deg C)
+// Pasandideh-Fard Table I: σ = 0.0728 N/m
+// 注: Foundation 版 OpenFOAM 不需要 wallAdhesion 关键字
+// interfaceProperties 自动检测 alphaContactAngle BC 并应用接触角修正

raw/droplet_impact/t09/constant/turbulenceProperties

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      turbulenceProperties;
+}
+
+simulationType  laminar;

raw/droplet_impact/t09/system/blockMeshDict

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      blockMeshDict;
+}
+
+// 液滴撞击算例
+// 参考: Pasandideh-Fard, M. et al. (1996). "Capillary effects during
+//       droplet impact on a solid surface." Phys. Fluids, 8(3), 650-659.
+// 域尺寸: 0.05m x 0.05m (~22D, D=2.25mm, 足够铺展-回缩)
+// 网格: 256 x 256 (~11 cells/D)
+
+scale   1;
+
+vertices
+(
+    (0      0      0)             // 0
+    (0.05   0      0)             // 1
+    (0.05   0.05   0)             // 2
+    (0      0.05   0)             // 3
+    (0      0      0.001)         // 4
+    (0.05   0      0.001)         // 5
+    (0.05   0.05   0.001)         // 6
+    (0      0.05   0.001)         // 7
+);
+
+blocks
+(
+    hex (0 1 2 3 4 5 6 7) (256 256 1) simpleGrading (1 1 1)
+);
+
+edges
+(
+);
+
+boundary
+(
+    bottomWall
+    {
+        type    wall;
+        faces   ( (0 1 5 4) );     // Y=0 面（撞击壁面）
+    }
+
+    topPatch
+    {
+        type    patch;
+        faces   ( (3 7 6 2) );     // Y=0.05 面（顶部开放边界）
+    }
+
+    leftWall
+    {
+        type    patch;
+        faces   ( (0 4 7 3) );     // X=0 面（侧面开放边界）
+    }
+
+    rightWall
+    {
+        type    patch;
+        faces   ( (1 2 6 5) );     // X=0.05 面（侧面开放边界）
+    }
+
+    defaultFaces
+    {
+        type    empty;
+        faces
+        (
+            (0 3 2 1)              // Z=0
+            (4 5 6 7)              // Z=0.001
+        );
+    }
+);

raw/droplet_impact/t09/system/controlDict

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      controlDict;
+}
+
+application     interFoam;
+
+startFrom       startTime;
+startTime       0;
+stopAt          endTime;
+endTime         0.2;            // 液滴撞击物理时长 [s]（铺展+初始回弹）
+
+deltaT          5e-06;          // 初始时间步 [s]（撞击过程需小时间步）
+writeControl    adjustableRunTime;
+writeInterval   0.008;           // 每 0.01s 保存一帧 → 50 帧（统一 10ms 间隔）
+
+purgeWrite      0;
+writeFormat     ascii;          // ASCII 格式，便于后处理脚本读取
+writePrecision  8;
+timeFormat      general;
+timePrecision   6;
+
+adjustTimeStep  yes;
+maxCo           0.5;
+maxAlphaCo      0.5;
+maxDeltaT       1e-04;          // 最大时间步上限
+
+functions       {};

raw/droplet_impact/t09/system/decomposeParDict

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      decomposeParDict;
+}
+
+numberOfSubdomains 16;
+
+method          hierarchical;
+
+hierarchicalCoeffs
+{
+    n           (4 4 1);
+    delta       0.001;
+    order       xyz;
+}

raw/droplet_impact/t09/system/fvSchemes

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      fvSchemes;
+}
+
+ddtSchemes
+{
+    default         Euler;
+}
+
+gradSchemes
+{
+    default         Gauss linear;
+}
+
+divSchemes
+{
+    default         none;
+
+    div(rhoPhi,U)                              Gauss linearUpwind grad(U);
+    div(phi,alpha)                             Gauss vanLeer;
+    div(phirb,alpha)                           Gauss interfaceCompression vanLeer;
+    div(((rho*nuEff)*dev2(T(grad(U)))))        Gauss linear corrected;
+}
+
+laplacianSchemes
+{
+    default         Gauss linear corrected;
+}
+
+interpolationSchemes
+{
+    default         linear;
+}
+
+snGradSchemes
+{
+    default         uncorrected;
+}
+
+wallDist
+{
+    method          meshWave;
+}

raw/droplet_impact/t09/system/fvSolution

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      fvSolution;
+}
+
+solvers
+{
+    "alpha.water.*"
+    {
+        nAlphaCorr      3;
+        nAlphaSubCycles 3;
+        cAlpha          1;
+
+        solver          smoothSolver;
+        smoother        symGaussSeidel;
+        tolerance       1e-8;
+        relTol          0;
+    }
+
+    "pcorr.*"
+    {
+        solver          PCG;
+        preconditioner  DIC;
+        tolerance       1e-5;
+        relTol          0;
+    }
+
+    "pcorrFinal.*"
+    {
+        $pcorr;
+        relTol          0;
+    }
+
+    "p_rgh.*"
+    {
+        solver          PCG;
+        preconditioner  DIC;
+        tolerance       1e-08;
+        relTol          0.01;
+    }
+
+    "p_rghFinal.*"
+    {
+        $p_rgh;
+        relTol          0;
+    }
+
+    "U.*"
+    {
+        solver          smoothSolver;
+        smoother        symGaussSeidel;
+        tolerance       1e-06;
+        relTol          0;
+    }
+}
+
+MULES
+{
+    nAlphaCorr      3;
+    nAlphaSubCycles 3;
+    cAlpha          1;
+}
+
+PIMPLE
+{
+    nOuterCorrectors    1;
+    nCorrectors         3;
+    nNonOrthogonalCorrectors 0;
+    MULESCorr           yes;
+    nLimiterIter        5;
+    momentumPredictor   no;
+    pRefCell            0;
+    pRefValue           0;
+}
+
+relaxationFactors
+{
+    equations
+    {
+        ".*" 1;
+    }
+}

raw/droplet_impact/t10/0/U.template

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       volVectorField;
+    object      U;
+}
+
+dimensions      [0 1 -1 0 0 0 0];
+
+// 初始值：全零；液滴区域由 gen_init_conditions.py 设置为 (0, -1.5, 0)
+internalField   uniform (0 0 0);
+
+boundaryField
+{
+    bottomWall
+    {
+        type            noSlip;     // 撞击壁面：无滑移
+    }
+
+    topPatch
+    {
+        type            pressureInletOutletVelocity;
+        phi             phi;
+        value           uniform (0 0 0);
+    }
+
+    leftWall
+    {
+        type            pressureInletOutletVelocity;
+        phi             phi;
+        value           uniform (0 0 0);
+    }
+
+    rightWall
+    {
+        type            pressureInletOutletVelocity;
+        phi             phi;
+        value           uniform (0 0 0);
+    }
+
+    defaultFaces
+    {
+        type            empty;
+    }
+}

raw/droplet_impact/t10/0/alpha.water.template

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       volScalarField;
+    object      alpha.water;
+}
+
+dimensions      [0 0 0 0 0 0 0];
+
+// 初始值：全部为空气（alpha=0）
+// 液滴半球区域由 gen_init_conditions.py 设置为 1
+internalField   uniform 0;
+
+boundaryField
+{
+    bottomWall
+    {
+        type            constantAlphaContactAngle;
+        theta0          75;           // Pasandideh-Fard (1996): stainless steel, theta_e ~ 70-80 deg
+        limit           gradient;
+        value           uniform 0;
+    }
+
+    topPatch
+    {
+        type            inletOutlet;
+        inletValue      uniform 0;
+        value           uniform 0;
+    }
+
+    leftWall
+    {
+        type            inletOutlet;
+        inletValue      uniform 0;
+        value           uniform 0;
+    }
+
+    rightWall
+    {
+        type            inletOutlet;
+        inletValue      uniform 0;
+        value           uniform 0;
+    }
+
+    defaultFaces
+    {
+        type            empty;
+    }
+}

raw/droplet_impact/t10/0/p_rgh

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       volScalarField;
+    object      p_rgh;
+}
+
+dimensions      [1 -1 -2 0 0 0 0];
+
+internalField   uniform 0;
+
+boundaryField
+{
+    bottomWall
+    {
+        type            fixedFluxPressure;
+        value           uniform 0;
+    }
+
+    topPatch
+    {
+        type            prghPressure;
+        p               uniform 0;
+        value           uniform 0;
+    }
+
+    leftWall
+    {
+        type            prghPressure;
+        p               uniform 0;
+        value           uniform 0;
+    }
+
+    rightWall
+    {
+        type            prghPressure;
+        p               uniform 0;
+        value           uniform 0;
+    }
+
+    defaultFaces
+    {
+        type            empty;
+    }
+}

raw/droplet_impact/t10/Allrun

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+#!/bin/bash
+# droplet_impact Allrun 脚本
+# 参考: Pasandideh-Fard, M. et al. (1998). Phys. Fluids, 10(3), 631-638.
+
+cd "$(dirname "${BASH_SOURCE[0]}")" || exit 1
+
+N_PROCS=${1:-1}
+
+echo "=== droplet_impact: blockMesh ==="
+blockMesh > log.blockMesh 2>&1
+if [ $? -ne 0 ]; then
+    echo "ERROR: blockMesh failed, see log.blockMesh"
+    exit 1
+fi
+
+if [ "$N_PROCS" -gt 1 ]; then
+    echo "=== droplet_impact: decomposePar (np=$N_PROCS) ==="
+    decomposePar -force > log.decomposePar 2>&1
+    if [ $? -ne 0 ]; then
+        echo "ERROR: decomposePar failed"
+        exit 1
+    fi
+
+    echo "=== droplet_impact: interFoam (parallel, np=$N_PROCS) ==="
+    mpirun -np "$N_PROCS" interFoam -parallel > log.interFoam 2>&1
+    if [ $? -ne 0 ]; then
+        echo "ERROR: interFoam failed"
+        exit 1
+    fi
+
+    echo "=== droplet_impact: reconstructPar ==="
+    reconstructPar > log.reconstructPar 2>&1
+else
+    echo "=== droplet_impact: interFoam (serial) ==="
+    interFoam > log.interFoam 2>&1
+    if [ $? -ne 0 ]; then
+        echo "ERROR: interFoam failed"
+        exit 1
+    fi
+fi
+
+echo "=== droplet_impact 完成 ==="

raw/droplet_impact/t10/constant/g

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+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       uniformDimensionedVectorField;
+    object      g;
+}
+
+dimensions      [0 1 -2 0 0 0 0];
+value           (0 -9.81 0);

raw/droplet_impact/t10/constant/polyMesh/boundary

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+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:                                        |
+|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       polyBoundaryMesh;
+    location    "constant/polyMesh";
+    object      boundary;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+5
+(
+    bottomWall
+    {
+        type            wall;
+        inGroups        1(wall);
+        nFaces          256;
+        startFace       130560;
+    }
+    topPatch
+    {
+        type            patch;
+        nFaces          256;
+        startFace       130816;
+    }
+    leftWall
+    {
+        type            patch;
+        nFaces          256;
+        startFace       131072;
+    }
+    rightWall
+    {
+        type            patch;
+        nFaces          256;
+        startFace       131328;
+    }
+    defaultFaces
+    {
+        type            empty;
+        inGroups        1(empty);
+        nFaces          131072;
+        startFace       131584;
+    }
+)
+
+// ************************************************************************* //