Skip to content
  • 0 赞同
    3 帖子
    4k 浏览
    K

    请问题主解决此问题了吗?

  • ICEM 2D 创建Y- bolck

    Meshy
    1
    0 赞同
    1 帖子
    2k 浏览
    L

    大家好!
    我想创建两个等腰直角三角形的Y型网格划分,2d不能直接创建Y-BLOCK,只查到了先O型划分再移动节点,间接建立Y Grid,但是这样就会影响我相邻块的关联,有什么办法能实现其划分吗?如下图,红色区域就是两个直角等腰三角形,其相邻的块都是矩形块,我用O型划分了一个,但是周围的块的关联已经很奇怪了。在此先谢过各位前辈了!

    cfd2fd2a-2a3a-457e-90da-8343185b0c87-image.png

  • 0 赞同
    2 帖子
    3k 浏览
    李东岳

    是的,理想气体,明天我更新下。

    另外,温度本身不是守恒变量,因此,CFD一般求解守恒变量,但是温度方程通常比较简单,一些不太成熟的代码会使用温度防尘

  • 大家做模拟用MATLAB多吗?

    CFD彩虹条
    10
    0 赞同
    10 帖子
    14k 浏览
    P

    @jerry 来的有点晚了,下载不了了。能给个书名吗?谢谢

  • 0 赞同
    1 帖子
    2k 浏览
    P

    英国谢菲尔德大学(The University of sheffield)Energy2050团队(http://energy2050.ac.uk)在招一个做CFD方向的全奖博士,做旋转填料床反应器捕捉二氧化碳的CFD仿真研究,对此职位感兴趣的研究生或者优秀本科毕业生可以申请(可直博),目前的申请截止日期是2022年7月22日(可能推迟),如来不及,入学时间可推迟到明年一月。

    谢菲尔德大学,世界百强名校,著名的CFD仿真软件Fluent的发源地,课题组学术氛围很好,适合静心搞科研。课题组在CFD领域有几十年的研究基础,在CCUS领域有丰富的研究资源,课题紧扣国内火热的"双碳"主题,该细分方向组里有7年的研究基础了,可以在前人的基础上接着做。

    具体招聘信息如下:
    We have a fully funded PhD studentship and look for applicants open to both UK and international students: Engineering doctorate (EngD): Predicting performance of intensified carbon capture inside rotating packed beds using CFD modelling

    If you know any good students from China, or the UK, please encourage them to apply.
    Any questions then let them to contact Professor Lin Ma: https://www.sheffield.ac.uk/mecheng/people/academic/lin-ma

    The advert is on findaphd.com: https://www.findaphd.com, search for the project 搜索 predicting performance of intensified carbon capture inside rotating packed beds using cfd modelling。

    或直接通过以下链接:https://www.findaphd.com/phds/project/engineering-doctorate-engd-predicting-performance-of-intensified-carbon-capture-inside-rotating-packed-beds-using-cfd-modelling/?p145128#opennewwindow

    Please make sure that they apply through the university of sheffield website: https://www.sheffield.ac.uk/postgraduate/phd/apply/applying.

    课题介绍:

    Carbon capture is considered the only technology able to decarbonise the hard-to-abate industries. many of these industries utilise legacy sites with little space for large new unit operations required in conventional carbon capture. rotating packed beds (RPB) look to solve this problem by intensifying carbon capture and reducing the footprint required by up to ten times, while also significantly decreasing the capital cost of these units. when combined with proprietary solvents, it is believed the cost of capture can be reduced to $30/tonne CO2 in some cases, helping to enable the rapid uptake of carbon capture and progression towards net zero.

    RPB are a novel technology that utilise the principles of process intensification to enhance the performance of mass transfer processes between fluids. given the application of rpb to the field of CO2 capture is relatively new, there is uncertainty regarding the impact of different process variables on the performance of the rpb that would otherwise require a significant amount of practical experimentation to investigate. computational fluid dynamics can enable the process to be accurately modelled, allowing for quick and inexpensive prediction of performance under various conditions.

    In this project a rotating packed bed absorber will be modelled in ansys fluent, with validation of the model’s outputs through use of the 1 tonnes of co2 per day (TPD) pilot-scale rotating packed bed absorber at the university of sheffield’s translational energy research centre. Initial research will involve investigating the impact of operational conditions and physical properties of the solvent on capture performance. As the project continues, the scope will widen to include sensitivity analysis of design parameters and the impact of scaling the RPB absorber on the existing project outputs and learnings. Additionally, further rotating unit operations could also be investigated.

    This project will utilise and develop your knowledge surrounding CFD modelling, mass and heat transfer, reaction kinetics and chemical equilibria. You will work closely with carbon clean, a global leader in the development of carbon capture technology and pioneers in the use of RPB for industrial decarbonisation. Your findings could directly impact the design and operation of commercial working carbon capture facilities, supporting the pathway to net zero.

    We are seeking applicants to start in september 2022.

    The project will be part of the EPSRC-supported centre for doctoral training in resilient decarbonised fuel energy systems. The student who undertakes it will be one of a cohort of over 50 students in a broad range of disciplines across the universities of sheffield, nottingham and cardiff.

    The research work will be based in the energy research group within the department of mechanical engineering and the translational energy research centre (TERC) at sheffield which is a brand new, high profile, innovation focused national research facility. You will be working within an exciting and dynamic group with approximately over 60 researchers undertaking a broad area of energy research with approximately three years' extensive research time in industry, preparing for high-level careers in the energy sector.

    Funding notes
    The studentship will cover full university fees and a tax-free, enhanced annual stipend of £20,352, including £16,062 (2022/2023) a year for four years and a stipend enhancement of £3,750 per annum.

    英国的全奖机会非常少,机会难得,欢迎各位优秀的CFDer申请!

  • pointwise到openfoam的输出问题

    Meshy
    5
    0 赞同
    5 帖子
    9k 浏览
    dybD

    @TINGHAIK 谢谢您,问题已解决

  • openfoam中添加新变量并输出

    OpenFOAM
    3
    0 赞同
    3 帖子
    4k 浏览
    M

    我也不是很懂,从代码角度来看,貌似只有进入了if判断语句中才会进行变量的输出?是不是得把IO操作放在外层

  • 关于在 udf 定义比热参数问题

    Fluent
    5
    0 赞同
    5 帖子
    8k 浏览
    两月三年

    @astremon 诶,还没有朝这个方向想过,以前一直udf里面只有只有函数和常量......

  • bubble colume算例一个

    OpenFOAM
    3
    0 赞同
    3 帖子
    3k 浏览
    李东岳

    是的,大约20秒之后

  • 0 赞同
    3 帖子
    4k 浏览
    李东岳

    是单位化的,写起来忒麻烦了没写一会我改一下。

    我试了一下
    \begin{equation}
    P=
    \left(
    \begin{matrix}
    1&2\\
    2&3
    \end{matrix}
    \right)
    \end{equation}
    这个就可以:136:

  • 如何处理奇点

    CFD彩虹条
    2
    0 赞同
    2 帖子
    3k 浏览
    李东岳

    如果a/b 是一条曲线, b有的时候为0

    要根治的话,就是让b不为0

  • 如何人为将曲率给定为一个定值

    OpenFOAM
    8
    0 赞同
    8 帖子
    10k 浏览
    Prometheus10P

    @李东岳 好的,东岳老师,我试试按照您说得这样算一下。

    另外我应该补充一下,100μm直径气泡的实验测得的浮升终速度大约是0.005~0.008m/s.

    e584ada7-1a05-4bb6-8cd8-f1e1997c43cc-image.png

    参考文献 Pawliszak, P., Ulaganathan, V., Bradshaw-Hajek, B.H., Manica, R., Beattie, D.A., Krasowska, M., 2019. Mobile or Immobile? Rise Velocity of Air Bubbles in High-Purity Water. J. Phys. Chem. C 123, 15131–15138.
  • 0 赞同
    6 帖子
    9k 浏览
    T

    你两相间的传热项选的什么?两相的温度是怎样的?

  • fluent里面旋转区域的问题

    Fluent
    3
    0 赞同
    3 帖子
    3k 浏览
    李东岳

    不知道你用什么网格生成软件。例如ICEM,interFace界面里外一般是单独做2套网格

  • 有人关注Grad、R13矩方法么?

    Algorithm
    2
    0 赞同
    2 帖子
    4k 浏览
    S

    这不是用来推导离散Boltzmann方程的方法吗?Hermite expansion and Gauss-Hermite quadrature????

  • ICEM网格节点设置问题

    Meshy
    3
    0 赞同
    3 帖子
    5k 浏览
    bestucanB

    @紫色星光 在设置节点数的小窗口,往下拉,有个copy parameter,不勾选。如果不勾选还会联动,那就是切块的问题了。

  • OpenFOAM网格序号重新命名?

    Meshy
    3
    0 赞同
    3 帖子
    4k 浏览
    D

    @东岳 谢谢老师,我已经找到网格生成规律了,从左至右,由下至上地规律依次生词。满足误之前需求工作,reNumberMesh有需要我再去琢磨吧,再谢!

  • CFD-DEM coupling时流体的求解器设置

    已移动 Algorithm
    1
    0 赞同
    1 帖子
    2k 浏览
    T

    各位大佬,请问CFD-DEM coupling时,流体的控制方程组求解,用耦合式解法还是分离式解法?
    非常感谢!

  • 关于sixDoFRigidBodyMotion

    Algorithm
    2
    0 赞同
    2 帖子
    5k 浏览
    fireztwF

    @金石为开 请教一下,这个六自由度动网格问题,是考虑了流固耦合作用的吗?,对于没有形变的刚体,和FsiFoam的流固耦合求解有什么区别吗?

  • fluent18.0并行疑问求指导

    Fluent
    4
    0 赞同
    4 帖子
    9k 浏览
    C

    谢谢~应该就是版本bug了
    感觉fluent实在玄妙 用了18.0 就算起来了 sigh