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云翳的黄昏

@云翳的黄昏
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最新

  • 网格转换writezones
    云 云翳的黄昏

    @李东岳 谢谢岳哥,问题解决了。具体原因我还没有分析出来,可能时我到处网格时出的问题,我用了一个简单的模型做了测试,没有之前的报错了。


  • 网格转换writezones
    云 云翳的黄昏

    @木木 同志,请问问题解决了吗?我现在也遇到了同样的问题,我的网格文件使用ansys mesh划分的,.msh文件中带有四面体和六面体两种网格,网格转化时也报类似的错误。之前单四面体或六面体网格都没有问题。请问怎么做才能解决这类问题,谢谢回复!
    error.png

    
    --> FOAM FATAL ERROR: 
    Cannot find match for first face. cell model: tet first model face: 3(1 2 3) Mesh faces: 
    4
    (
    0()
    0()
    0()
    0()
    )
    

  • 静置液滴表面利用自适应网格导致初始化后的液滴表面不稳定,如何解决
    云 云翳的黄昏

    @sungda openfoam自带的自适应网格目前好像还是针对三维(三个方向都加密),你可以试一下三维的,应该问题不大,我目前类似的算例没有出现这个问题。主要注意:固定时间步长时,时间步长调略微小点;变时间步长,如果还有相同的结果,库朗数调小一点。


  • 静置液滴表面利用自适应网格导致初始化后的液滴表面不稳定,如何解决
    云 云翳的黄昏

    @史浩 嗯嗯,谢谢哥,我试试


  • 静置液滴表面利用自适应网格导致初始化后的液滴表面不稳定,如何解决
    云 云翳的黄昏

    @同学博 我目前是把时间步长调小一点,但是不是每个算例都能成功。


  • OpenFoam中的溃坝算例加入自适应网格计算一定时间步后出现的问题
    云 云翳的黄昏

    @史浩 恩恩,谢谢大哥!我好好学习一下,有问题再请教!


  • 静置液滴表面利用自适应网格导致初始化后的液滴表面不稳定,如何解决
    云 云翳的黄昏

    我现在计算一个大空间中放置一个单液滴,利用setField,完成了对液滴体积分数场alpha1的初始化。然后利用interDyMFoam进行计算。结果出现了图中现象。理论上也第应该越来越稳定光滑,但液滴自行破碎了,可能的原因就是界面网格突然加密,导致原始体积分数alpha1初始化界面较为粗糙(锯齿状),自适应密网格下被放大,使表面上计算的表面张力值增大,导致相界面边缘破碎。请问各位大佬有没有遇到过类似的问题,都是怎么解决的,麻烦给点意见!谢谢!
    初始化:
    1.png
    自适应后:
    2.png
    0速度场内一段时间后:
    3.png


  • OpenFoam中的溃坝算例加入自适应网格计算一定时间步后出现的问题
    云 云翳的黄昏

    这个应该是自适应在二维网格下计算过程中出现的问题,后来尝试把二维算例改成三维算例。就不会出现计算过程中断的问题了。因为我目前还在学习,具体原因尚不清楚。有对这一部分深入研究的可以补充,我也学习一下,谢谢!也帮助我们这些初级学习者快速入门,尽快排除bug


  • OpenFoam中的溃坝算例加入自适应网格计算一定时间步后出现的问题
    云 云翳的黄昏

    @云翳的黄昏

    OpenFoam-2.3.1
    Interface Courant Number mean: 0.0038340104 max: 0.84420783
    Courant Number mean: 0.037028394 max: 0.99652771
    deltaT = 5.2872478e-05
    Time = 0.31246054
    
    Selected 124 cells for refinement out of 273070.
    Refined from 273070 to 273938 cells.
    Selected 83 split points out of a possible 32348.
    Unrefined from 273938 to 273357 cells.
    Execution time for mesh.update() = 3.39 s
    DICPCG:  Solving for pcorr, Initial residual = 1, Final residual = 9.8048258e-06, No Iterations 389
    time step continuity errors : sum local = 5.4228827e-10, global = -2.51365e-13, cumulative = 0.00017816493
    smoothSolver:  Solving for alpha.water, Initial residual = 0.00055204007, Final residual = 6.4208784e-09, No Iterations 2
    Phase-1 volume fraction = 0.13010958  Min(alpha1) = -9.3530875e-08  Max(alpha1) = 1.0000001
    MULES: Correcting alpha.water
    MULES: Correcting alpha.water
    Phase-1 volume fraction = 0.13010958  Min(alpha1) = -1.3561514e-05  Max(alpha1) = 1.0000079
    GAMG:  Solving for p_rgh, Initial residual = 0.033205248, Final residual = 0.00014731475, No Iterations 2
    #0  Foam::error::printStack(Foam::Ostream&) at ??:?
    #1  Foam::sigFpe::sigHandler(int) at ??:?
    #2   in "/lib/x86_64-linux-gnu/libc.so.6"
    #3   at tensorField.C:?
    #4   in "/home/vaseatar/OpenFOAM/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/bin/interDyMFoam"
    #5   in "/home/vaseatar/OpenFOAM/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/bin/interDyMFoam"
    #6   in "/home/vaseatar/OpenFOAM/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/bin/interDyMFoam"
    #7  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
    #8   in "/home/vaseatar/OpenFOAM/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/bin/interDyMFoam"
    

    上面图片好像没有显示,抱歉!这里添加一下报错误的文本

    OpenFoam-7
    Courant Number mean: 0.0742364 max: 0.985473
    Interface Courant Number mean: 0.0103739 max: 0.761644
    deltaT = 0.000210711
    Time = 0.331036
    
    Selected 20 cells for refinement out of 36008.
    Refined from 36008 to 36148 cells.
    Selected 7 split points out of a possible 4206.
    Unrefined from 36148 to 36099 cells.
    DICPCG:  Solving for pcorr, Initial residual = 1, Final residual = 9.59577e-06, No Iterations 208
    time step continuity errors : sum local = 1.48015e-09, global = 1.6711e-12, cumulative = 0.000723778
    smoothSolver:  Solving for alpha.water, Initial residual = 0.00142426, Final residual = 1.32652e-09, No Iterations 3
    Phase-1 volume fraction = 0.130119  Min(alpha.water) = -4.43817e-11  Max(alpha.water) = 1
    MULES: Correcting alpha.water
    MULES: Correcting alpha.water
    Phase-1 volume fraction = 0.130119  Min(alpha.water) = -3.77094e-05  Max(alpha.water) = 1
    DICPCG:  Solving for p_rgh, Initial residual = 0.0515556, Final residual = 0.0021802, No Iterations 2
    time step continuity errors : sum local = 0.000166589, global = -9.96186e-07, cumulative = 0.000722782
    DICPCG:  Solving for p_rgh, Initial residual = 0.00314206, Final residual = 0.000140061, No Iterations 10
    time step continuity errors : sum local = 1.0632e-05, global = -3.56508e-07, cumulative = 0.000722425
    DICPCG:  Solving for p_rgh, Initial residual = 0.000874623, Final residual = 9.92427e-08, No Iterations 170
    time step continuity errors : sum local = 7.53188e-09, global = -2.18209e-10, cumulative = 0.000722425
    ExecutionTime = 431.97 s  ClockTime = 432 s
    
    Courant Number mean: 0.0750393 max: 0.990053
    Interface Courant Number mean: 0.0104568 max: 0.765205
    deltaT = 0.000210711
    Time = 0.331247
    
    Selected 20 cells for refinement out of 36099.
    Refined from 36099 to 36239 cells.
    Selected 12 split points out of a possible 4220.
    Unrefined from 36239 to 36155 cells.
    DICPCG:  Solving for pcorr, Initial residual = 1, Final residual = 8.95937e-06, No Iterations 199
    time step continuity errors : sum local = 1.55988e-09, global = 1.04349e-11, cumulative = 0.000722425
    smoothSolver:  Solving for alpha.water, Initial residual = 0.00142307, Final residual = 1.50653e-09, No Iterations 3
    Phase-1 volume fraction = 0.130116  Min(alpha.water) = -4.43604e-11  Max(alpha.water) = 1
    MULES: Correcting alpha.water
    MULES: Correcting alpha.water
    Phase-1 volume fraction = 0.130116  Min(alpha.water) = -4.22756e-05  Max(alpha.water) = 1
    DICPCG:  Solving for p_rgh, Initial residual = 0.0570999, Final residual = 0.00183939, No Iterations 3
    #0  Foam::error::printStack(Foam::Ostream&) at ??:?
    #1  Foam::sigFpe::sigHandler(int) at ??:?
    #2  ? in "/lib/x86_64-linux-gnu/libc.so.6"
    #3  ? at tensorField.C:?
    #4  ? in "/home/vaseatar/OpenFOAM/OpenFOAM-7/platforms/linux64GccDPInt64Opt/bin/interFoam"
    #5  ? in "/home/vaseatar/OpenFOAM/OpenFOAM-7/platforms/linux64GccDPInt64Opt/bin/interFoam"
    #6  ? in "/home/vaseatar/OpenFOAM/OpenFOAM-7/platforms/linux64GccDPInt64Opt/bin/interFoam"
    #7  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
    #8  ? in "/home/vaseatar/OpenFOAM/OpenFOAM-7/platforms/linux64GccDPInt64Opt/bin/interFoam"

  • OpenFoam中的溃坝算例加入自适应网格计算一定时间步后出现的问题
    云 云翳的黄昏

    请问各位大佬有没有曾经遇到过算例计算过程中提示“浮点数例外 (核心已转储)”
    ,谢谢帮忙解答!
    我最近在学习interFOAM求解器相关知识,目前向使用interFOAM求解器加上自适应网格计算两相流问题,在利用OpenFoam自带算例修改无报错后,开始利用interDyMFoam进行求解。但何运算基本在0.3s附近出现下图中的错误中断(of2.3.1和of7中都出现了该报错)
    ![0_1596110438484_2020-07-30 19-57-10屏幕截图.png](正在上传 100%)
    ![0_1596110989816_2020-07-30 20-06-37屏幕截图.png](正在上传 100%)
    而且还有一个问题,但何运行计算到0.3s附近出现该错误,双核并行0.1s,四个核时亦不就中断了。无自适应时算例能正常计算。
    麻烦各位大哥有知道y原因的帮忙回答一下,谢谢!


  • rhoSimpleFoam:k-epsion 湍流Pr数
    云 云翳的黄昏

    谢谢岳哥。对于我的问题,Prt是一个与速度温度等参数有关的表达式,请问如何在求解器中设置湍流Pr数的值?在rhoSimpleFoam求解器对应的算例中,可以修改的位置在哪?我刚开始接触这一部分,可能问的问题比较浅。感谢回答!


  • rhoSimpleFoam:k-epsion 湍流Pr数
    云 云翳的黄昏

    请问对于rhoSimpleFoam求解器算例,湍流求解k-epsino中的湍流Pr数如何修改?谢谢各位大佬指导

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