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  • 欧盟双燃料内燃机项目“EDEM”简介

    CFD彩虹条
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    李东岳

    老铁这个排版排的哎 :134:

  • CFD青年成长支持计划(2021)

    公告
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    F

    想问一下李老师这个计划还有吗!!很想要这本湍流模型:mianmo:

  • ICEM CFD中,关联(associate)的作用?

    Meshy
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    C
    有的时候,某些内部的情况,没有几何,但是需要对网格进行一些处理,就需要手动的在不能关联的情况下,切一下。 某些需要投影的情况,比如地面上悬空的一个圆筒。在地面上只有圆筒的投影,也不存在几何关系。需要把edge投影过去,就需要spline方法。
  • 用icem画平移周期性网格

    Meshy
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    @搬运工 后来我发现我这个问题不是周期性问题,虽然结构具有周期性,谢谢你的解答:happy:

  • fluent降温凝析出水

    Fluent
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    这种属于相变模型 实际上fluent内置已经做得比较主流了 但是如果你需要更高精度的模型 还是得编UDF

  • ICEM里“块”和“模型”是什么关系?

    Meshy
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    Elibathe康E

    块就是将你的整个计算区域分割成几个区域,每个区域有各自的网格分布规律;
    模型应该是你计算的几何外形吧

  • 圆柱绕流-深度学习-Fluent比对压力系数

    Fluent
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    李东岳

    大略看一眼,主要算法貌似在这篇文章吧?:https://www.sciencedirect.com/science/article/pii/S0021999118307125
    2019年发的,现在引用了180次...

    感觉是个神文,用tensorFlow算偏导数

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    可参考该篇博文:http://liusuanyatong.blog.163.com/blog/static/2155951572016527422386/

  • Fluent这种情况下运行出错是怎么回事

    Fluent
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    4

    网格检查没有错,但是一运行就不行了,不懂啥意思啊。。。

  • UCSD-SDSU 联合博士项目招生

    CFD彩虹条
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    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.

  • 广义NS方程的通式含义

    Algorithm
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    C

    你需要系统看一下流体力学的相关知识,可能你没有这方面的背景所以不太理解。对物理空间中的一块区域而言,其所包含的物理量有几种变化方式,要么它自己随时间在变化(变化率,比如密度因为温度升高降低了),要么因为有流动带它进来或者出去(对流,比如能量),要么它自己在向外扩散或者外部在向这块区域扩散(扩散,比如这一块是高浓度区域而周围是低浓度),要么这块区域中这个物理量自己在生成或者消灭(源项,比如有化学反应)。所有的这些变化,都需要满足物理学的基础即守恒定律,其数学表达就是所谓的“广义”NS方程。这里“广义”是指这个方程描述了物理量的一般过程。

    phi等于1,这个方程代表质量守恒;phi等于速度,这个方程代表动量守恒;phi等于内能,这个方程代表能量守恒;phi等于某个物质的浓度,那么这个方程就代表该物质的质量守恒,等等。

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    五好青年

    请教各位大佬

    问题:OpenFOAM中重叠网格,六自由度运动。关于物体属性设置请教

    算例:我算六自由度运动,想定义模型上面1和下面2,两部分密度不同。(就是材料不同)

    目前问题:我试过分开给属性,就变成2个模型了啊,但是我想让模型是一个整体啊。这个咋定义呢?感谢

    23423432.png

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    supersoldierS

    @liqiwen 还可以对结构网格进行二次开发, [基于FLUENT软件的导弹意外点火情况下舱室维护仿真平台开发

    ](http://d.g.wanfangdata.com.cn/Thesis_D429353.aspx)这个论文的3.1.2节有讲用index来对ICEM CFD二次开发的功能。

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    李东岳

    见过一些,目前也不好解释。:141:

  • foam-extend的fsiFoam并行效率问题

    OpenFOAM
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    五好青年

    @number44 在 foam-extend的fsiFoam并行效率问题 中说:

    foam-extend的icoFsiFoam

    您好,请问下,下面两者有什么区别呢?
    foam-extend中自带的icoFsiFoam

    单独的fsiFoam

  • 【UDF】旋度

    Fluent
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    最近在用UDF求一组UDS的旋度,公式都正确,但是最后出来的旋度云图却很奇葩,和正常的不一样,有没有遇到过这种问题讨论一下。

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    Cp_ZhaoC

    好像是分内部点(所有面都不是边界)和边界点,内部点根据cell插值(距离倒数分之一),边界点根据face插值。

  • 这种显卡可以运行Ansys dicover live 吗?

    Fluent
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    捕获.JPG

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    M

    @baojd42 想请教下您,最后成功了吗?RapidCFD可以在GPU上完美运行吗...谢谢了

  • 【UDF】项不会计算为接受n个参数的函数

    Fluent
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    L

    b8d50033-df4d-481e-afcd-5f784bf3a5e2-image.png
    e3eeba83-26ce-4e15-b50c-9ba01d0ddba5-image.png
    错误对应的语句也只是简单的UDM赋值语句,请问这个错误出现的原因在哪里,或者应该从哪些方面排查这些错误呢?