Skip to content
  • 流体区域内部可以设置进出口吗

    Fluent
    2
    0 赞同
    2 帖子
    3k 浏览
    Q

    不可以,但是可以设置为风扇边界

  • 0 赞同
    4 帖子
    11k 浏览
    hangszH

    SRF和MRF只是坐标系变换,将旋转问题变成stationary问题,所以湍流模型还是适用的。

    但是对于旋转问题或者流线弯曲问题,湍流模型是要进行修正的。

    参看: 《Some improvements in Menter's k-omega SST turbulence model》

  • ercoftac泵,OpenFOAM可压缩算例

    OpenFOAM
    1
    0 赞同
    1 帖子
    3k 浏览
    李东岳李

    稳态算例点击下载 | 瞬态算例点击下载

    瞬态算例下载地址

  • 0 赞同
    3 帖子
    5k 浏览
    杨英狄杨

    @杨英狄 感谢感谢!

  • UCSD-SDSU 联合博士项目招生

    CFD彩虹条
    1
    0 赞同
    1 帖子
    3k 浏览
    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.

  • 网格的艺术,网格Show?

    Meshy
    4
    0 赞同
    4 帖子
    17k 浏览
    下

    @李东岳 车灯热分析。

  • 0 赞同
    4 帖子
    10k 浏览
    李东岳李

    @搬运工

    高斯迭代法处理20阶矩阵就已经非常慢了。通常和多重网格+高斯赛德尔求解器一起处理。并且OpenFOAM这种成熟的商软里面矩阵求解器算法非常精炼。通常由主求解器+预处理+光顺+重组构成。多重网格更是复杂。另外,在编程的时候使用动态、寻址的方法寄存系数。

    所以如果你要写一个快速的求解器:

    使用外挂包; 潜心研究稀疏线性系统求解理论;我建议花大量时间研读:YousefSaad, 2003。看看大型稀疏矩阵怎么求解的。而不是3/4阶矩阵的高斯塞德尔求解器。:cheeky:
  • lagrangian库如何跟踪一个颗粒

    OpenFOAM
    11
    0 赞同
    11 帖子
    15k 浏览
    星

    @lrl3512 这你就遇到了难点,比如parcel穿过processor怎么办?你想想有没有其他的方法能单独对每个parcel赋值?

  • latex这个代码怎么省略

    CFD彩虹条
    4
    0 赞同
    4 帖子
    5k 浏览
    L

    mark 一下

  • 0 赞同
    4 帖子
    9k 浏览
    C

    @pippowong
    可以简单说说这种非常大尺寸的大气模拟和普通的流场模拟的区别么?以及相关的侧重点?

  • probes文件夹合并

    OpenFOAM
    5
    0 赞同
    5 帖子
    7k 浏览
    李东岳李

    没啥影响

  • 0 赞同
    1 帖子
    2k 浏览
    小

    替代文字7}~AR@VWJ{%2BI5BT$G$SLV.jpg

  • 0 赞同
    5 帖子
    8k 浏览
    L

    @李东岳 嗯,两个一起下下来就可以的,之前理解错了。

  • 关于涡的各种复数

    CFD彩虹条
    2
    0 赞同
    2 帖子
    4k 浏览
    bestucanB

    Screenshot_20211204_182532_cn.dictcn.android.digitize.oxford_oalecd9_17203.jpg

  • ICEM为什么要分块?

    Meshy
    4
    0 赞同
    4 帖子
    11k 浏览
    H

    @搬运工不好当 就是为了分块,分成的块就有映射特征,画成结构性网格

  • 0 赞同
    2 帖子
    6k 浏览
    W

    Navier-Stokes 方程中的对流项写作 $\nabla \cdot (\textbf{u}\phi)$,扩散项写作 $\nabla \cdot (\nu \nabla \phi)$。

    对流表示流体微团从空间某点运动到另一点的过程,而扩散则表示流体物理性质浓度变化的过程。

    对动量方程而言 $\phi=\textbf{u}$,因此对流项变为 $\nabla \cdot (\textbf{u} \textbf{u})$,为非线性项。一些算法将其中一个速度作为已知量,另一个作为未知量离散求解。可参考icoFoam解析。

  • 0 赞同
    3 帖子
    5k 浏览
    G

    @wuyukai 请问你这个问题解决了吗?我遇到同样的问题

  • 0 赞同
    5 帖子
    13k 浏览
    李东岳李

    @luomuliunian 大佬这个专业了

  • Aspect ratio 达到300多,如何调小呢

    Meshy
    7
    0 赞同
    7 帖子
    17k 浏览
    S

    @cfd-china
    恩恩,:laughing:

  • 带挡板的晃荡

    OpenFOAM
    1
    0 赞同
    1 帖子
    2k 浏览
    李东岳李

    直接Allrun开算,OpenFOAM-10适配

    baffleVOF.tar.xz

    微信图片_20230728160847.png