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  • 论文投稿的期刊选择

    CFD彩虹条
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    李东岳

    基于OpenFOAM开发了一个简单的程序,做的是气液两相流模拟

    看起来更符合 international journal of multiphase flow。不过这俩个都是好期刊,能中哪个都行。在我眼里没什么区别。

  • UCSD-SDSU 联合博士项目招生

    CFD彩虹条
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    O

    Job description
    We provide the opportunity for the joint Ph.D. program between UCSD and SDSU.

    Research motivation
    Do you know that measurement in a turbulent environment has its own "sixth
    sense"? In fluid dynamical systems, measurements can be used to figure out
    events that happened far away from the probing location.
    Through state-of-art data assimilation techniques, we can trace back the origin
    of any information we have measured. We used this technique to locate the
    release of a pollution release, and reconstruct unknown flow fields from limited
    measurements.

    Are you self-motivated to do a Ph.D. in interdisciplinary researches about fluid
    dynamics, inverse problems, and optimization? We are looking for Ph.D. students
    that are willing to spend time studying in an encouraging and creative
    environment!

    There has been a long-hovering question about how to combine experimental
    measurements with numerical simulations. Especially in terms of designing a
    turbulence model that agrees with experimental studies. In addition, the design
    of sensor networks or sensor weighting can be optimized in terms of the amount
    of information obtained.
    In this Ph.D. project, you will develop novel simulation techniques that combine
    machine learning techniques with data assimilation.

    The required skills and preferred profile
    We are looking for self-motivated young researchers from mechanical
    engineering, aerospace engineering, computational physics, applied mathematics,
    or other closely related areas.

    Familiar with MATLAB and FORTRAN with MPI. C++ and python is a plus. Good conceptual understanding of calculus and linear algebra. Experience with simple machine learning algorithms. Good communication skills including presentation skills, academic writing
    with latex or word. Please note that the GRE is required for all JDP applicants and cannot be
    waived. Having a part-time hobby is a plus.

    Location
    Work is carried out in the Data Assimilation group at Aerospace Engineering, San Diego State University.
    We study various inverse problems in fluid dynamics using numerical simulations
    with the discrete adjoint operator.
    For further information, please visit us at
    https://qiwang.sdsu.edu/

    Information and application
    Interested applicants should visit
    https://www.engineering.sdsu.edu/admissions/jointdoc_areomech.aspx
    for more details about applying for the joint program.
    Meanwhile, please reach out to Qi Wang (qwang4@sdsu.edu), including:
    • A short description of your qualifications and motivation to apply for this
    position.
    • CV or resume.
    • Transcripts from your Bachelor and Master degrees.
    Selected candidates will be invited to an interview and should prepare a
    scientific presentation as part of the requirements.

    We highly value diversity at our university. Applicants from all backgrounds are
    welcomed.

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    李东岳

    reFineMesh可以加密一个方向,这个需要指定区域,你试试topoSet+refineMesh呢》

  • 边界条件引起的震荡

    Algorithm
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    李东岳

    0_1497945059409_2017-06-20 15-50-42屏幕截图.png

    震荡已经非常非常小了,

  • 请教OpenFOAM不同网格之间场映射的原理

    OpenFOAM
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    李东岳

    meshToMeshInterpolate.C 可以看看这个内容,对,就是插值

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    李东岳

    @luomuliunian 大佬这个专业了

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    考古来了 想看看大佬的论文

  • 关于FVM的几何修正

    Algorithm
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    李东岳

    不是很了解这个技术。

  • 关于涡的各种复数

    CFD彩虹条
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    bestucanB

    Screenshot_20211204_182532_cn.dictcn.android.digitize.oxford_oalecd9_17203.jpg

  • UDF函数求助

    Fluent
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    西湖冷月西

    @bestucan 厉害,第一次知道这种用法!:146:

  • 关于openfoam网格转换

    Meshy
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    用的windAroundBuildings算例,840万网格的二维模型,网格质量检查过了,计算域是14000*4000米。epsilonInlet 0.0003; // Cmu^0.75 * k^1.5 / L ; L =10

    dimensions [0 2 -3 0 0 0 0];

    internalField uniform $epsilonInlet;

    boundaryField
    {
    INLET
    {
    type fixedValue;
    value uniform $epsilonInlet;
    }

    OUTLET { type zeroGradient; } WALL { type epsilonWallFunction; value uniform $epsilonInlet; } frontAndBackPlanes { type empty; } #includeEtc "caseDicts/setConstraintTypes"

    }
    kInlet 1.5; // approx k = 1.5*(I*U)^2 ; I = 0.1

    dimensions [0 2 -2 0 0 0 0];

    internalField uniform $kInlet;

    boundaryField
    {
    INLET
    {
    type fixedValue;
    value uniform $kInlet;
    }
    OUTLET
    {
    type zeroGradient;
    }

    WALL { type kqRWallFunction; value uniform $kInlet; } frontAndBackPlanes { type empty; } #includeEtc "caseDicts/setConstraintTypes"

    }
    nut
    internalField uniform 0;

    boundaryField
    {
    INLET
    {
    type calculated;
    value uniform 0;
    }

    OUTLET { type calculated; value uniform 0; } WALL { type nutUSpaldingWallFunction; value uniform 0; } frontAndBackPlanes { type empty; } #includeEtc "caseDicts/setConstraintTypes"

    }
    p
    internalField uniform 0;

    boundaryField
    {
    INLET
    {
    type zeroGradient;
    }
    OUTLET
    {
    type fixedValue;
    value uniform 0;
    p0 uniform 0;
    }
    WALL
    {
    type zeroGradient;
    }
    frontAndBackPlanes
    {
    type empty;
    }

    #includeEtc "caseDicts/setConstraintTypes"

    }
    Uinlet (10 0 0);

    dimensions [0 1 -1 0 0 0 0];

    internalField uniform (10 0 0);

    boundaryField
    {
    INLET
    {
    type fixedValue;
    value uniform $Uinlet;
    }
    OUTLET
    {
    type zeroGradient;
    }

    WALL { type noSlip; } frontAndBackPlanes { type empty; } #includeEtc "caseDicts/setConstraintTypes"

    }
    时间步长试过1 0.1 0.01 其他的都没动

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    李东岳

    不是很清楚你说的那种涡脱落现象。不过用户指南中我记得有一章曾经表示,大体意思为:“如果用稳态求解器模拟比较强的非稳态问题会出现残差的震荡”。

    能否附稳态求解涡街的文献?谢谢。

  • ICEM划分网格

    Meshy
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    H

    @Junren-Hou 在 ICEM划分网格 中说:

    可以试试check block,有些时候其实没有问题,就它软件自己的毛病,然后block里最后有一个check block,可以让他自己检查一下。里面有好多选项,都试试,什么check/fixed block

    回忆了一下,我的旋转区域用ICEM画的应该没有问题。出问题的应该是我画的外流场区域,一方面追求地面边界层,致使网格尺度过小,一方面为了平衡网格数量,过渡不均匀。猜测应该是外流区域的地面边界层设置导致了相关报错的产生。

  • OpenFOAM22x编译错误

    OpenFOAM
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    @赵一铭

    感谢分享!最近安装低版本的OpenFOAM做原有的程序二次开发,用到了这个语句~~,

    在此分享一个基于不同Linux系统的OpenFOAM不同版本安装总结,亲测OF211,OF231 再 Ubuntu 16.04 安装成功无Error!

    https://openfoamwiki.net/index.php/Installation/Linux

    再次感谢!

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    L

    @李东岳 嗯,两个一起下下来就可以的,之前理解错了。

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    @深蓝 请问您找到输入粒径分组的方式了吗?我最近也要做这方面,如果您看到了请您教我一下

  • 有会STAR-CCM、COMSOL、CFX的老铁么?

    CFD彩虹条
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    李东岳

    https://www.cfd-china.com/topic/5198

    参考这个帖子,有人可以做个STAR-CCM、COMSOL、CFX的算例么?

  • ANSYS 超算平台的使用

    CFD彩虹条
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    @桑葚熟了 目前没有用这些集群了,天河没用过,北京超算云那边感觉服务和价格都还不错,EasyCAE这边很久之前用的了之前价格有点小贵,现在不清楚了。

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    M

    fluent边界里是有质量流入和质量流出的,主要是可压问题用。不过理论手册并没有提及是怎么处理的。

  • 怎么把mapfields的code写进solver里?

    OpenFOAM
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    L

    您好,这里两种网格求解的方程形式一样吗?您是研究多尺度模拟的吗?我也想尝试OpenFoam里植入一种多尺度算法,是否方便交流一下