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  • 关于动量方程表面源项的离散问题

    Algorithm
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    Mrc.YoungM

    @东岳 对于$\nabla{\mathbf{U}}$的矩阵形式应该是什么这个问题,从张量的角度来看我站第一种写法,更规范。:huahua:
    但是从CFD角度来看,公式这东西本就是规则,制定了规则就是交流用的, 可读性和易理解性还是更为重要的。看个人理解,我觉得并无好坏。:mianmo:

  • 航空航天方面的企业推荐

    CFD彩虹条
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    N

    @liujuncfd
    本科待遇年薪15w左右,硕士年薪20w左右,博士年薪25w。
    https://www.zhipin.com/job_detail/fe4f05de98c982591nN62Ni7GVZT.html?ka=hot-job-1

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    L

    标准的限制方法是保证插值后网格顶点(vertice)的值不会出现极大值或极小值(比周围网格的最大值大或比周围网格的最小值小)因为梯度插值最容易出现越界值的就是在顶点处,从而用一个标量来scale梯度gradient;另外一种方法是保证网格的面心midponts of cell faces处不出现极大值或极小值即可,就认为满足了插值后不存在越界的问题。我想的是关于第二种方法,面心处插值后不出现最大值或最小值不能代表顶点处不出现最值,对吗

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    I

    @bestucan 好吧,谢谢。我再琢磨琢磨

  • 气液两相流

    Fluent
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    F

    @wdhj 试过了没有?结果怎么样呢,请给反馈

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    S

    您好,我想在您这个回答的基础上再问一个问题。由于在rigidBodyMotion求解器中,centraOfMass是相对于centraOfRotation,那么sixDoFRigidBodyMotion求解器中的momentOfInertia改成rigidBodyMotion求解器中的interia应该做何种变换呢?

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    李东岳

    主任招博士后不,我给您发个简历

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    李东岳

    我没太跟随数值传热学中压力修正方程的推导,目前还不能给出推导:tishizi:

    我自己的推导 http://dyfluid.com/docs/RhieChow.html

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    L

    SPH-DEM是否适合做气液固三相搅拌

  • CFD人才招聘流体力学GPU计算CUDA计算

    CFD彩虹条
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    N

    专业:流体力学、传热学相关专业
    主要职责:用C++语言,进行CUDA和GPU计算开发CFD计算软件。负责流动、燃烧及传热等仿真软件的开发及封装;
    工作地点:长沙
    公司性质:央企中国电子信息集团所属子公司,协同NUDT研发
    薪酬待遇:本科年薪15W左右,硕士年薪20W左右,博士25W左右
    其中一个招聘链接
    https://www.zhipin.com/job_detail/fe4f05de98c982591nN62Ni7GVZT.html?ka=hot-job-1

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    李东岳

    是的,可以。

  • 汽液两相沸腾模拟计算

    Fluent
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    AstremonA

    @风雨过后 eulerian 模型 中 热传导模型与你选着的子模型关系较大。

  • 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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    towerT

    请问有谁对 bodyPoint(refAttachmentPt_)这个函数了解吗?
    这是函数的具体实现:

    inline Foam::point Foam::RBD::restraint::bodyPoint ( const point& p ) const { return (model_.X0(bodyID_).inv() && spatialVector(Zero, p)).l(); // 双内积 }
  • 哪位大佬用过投影仪看电视

    CFD彩虹条
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    李东岳

    @同学博 :jingya: 那我还不太知道。不知道这俩是不是一个东西。激光电视目前倒是销量比较差 :qichuang:

  • 初始流速场流速分布不合理

    OpenFOAM
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    @李东岳 好的,谢谢老师

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    李东岳

    如果不考虑时间项
    \begin{equation}
    \int^{f+1}_ {f} \frac{\partial}{\partial x}\left(\alpha \frac{\partial \phi}{\partial x}\right)\mathrm{d}x=\left(\alpha \frac{\partial \phi}{\partial x}\right)_ {f+1}-\left(\alpha \frac{\partial \phi}{\partial x}\right)_ {f}
    \end{equation}
    把后面两项$\left(\alpha \frac{\partial \phi}{\partial x}\right)_ {f+1}-\left(\alpha \frac{\partial \phi}{\partial x}\right)_{f}$把所有的面连起来,看起来是守恒的,剩下的只有边界条件

  • 在安装CFDEM时,安装不了LPP

    OpenFOAM
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    liuxinL

    @JokerZhu 是的,但是githubfast已经关停了好像,去github官网搜就行了

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    取平均之后计算很快。 如果你需要瞬态流场以及瞬态的各项数据,你就用瞬态。 如果你只是想得到一个平均流场,那就用平均。

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    Q

    就是简单的翼型震荡俯仰运动