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CFD彩虹条

有界的CFD!无界的讨论!

483 主题 2.4k 帖子
  • 如何改变系统识别的CPU核数及线程数

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    C

    @bestucan 运行第一行,物理CPU直接就是32

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    @ghuaa 好的,谢谢回复!

  • 想问下有从事风工程的同学吗

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    想以后从事结构方面的工作结合着CFD,基本就是风工程这块了。想找找这方面的职位,计算,研究,工作都可,想问下有这方面的同学吗,可以请教学习一下,谢谢!
    不知道这里发帖是否合适,先谢谢大家!

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    想问下这个职位还招人吗,谢谢!

  • M1制作免费ubuntu虚拟机

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    R

    感谢分享。不过虚拟机的话用UTM(免费)很方便,直接加载官方镜像安装即可。我在UTM里的Ubuntu20.04(Focal)里成功编译了OF8,9和OF v2012。

  • 最简单的access家里的电脑的方式是?

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    @李东岳 光猫要是有端口转发功能的话,你可以转发端口到你的内部ip

    比如ssh 是22 于是你就转22号端口到你的本地机器192.168.1.111的22端口
    你在外网 ssh 就行,关键是转发

  • 5 帖子
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    Prometheus10P

    @李东岳 啊:xinlei: ,东岳老师,您这么一提醒我才发现自己没有去看paraview.org的Linux分页面,我之前心思一直都在paraview.org的win版本页面上:zoule: ,再次谢谢东岳老师,抱歉又给您添麻烦了:135: 。

  • kvm也挺奇葩的

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    李东岳

    买了个迈拓维矩的,这个可以切换,并且用起来目前来看还可以

  • 如何处理奇点

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    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

  • 为啥乒乓球不带坑,高尔夫球带坑?

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    A

    乒乓球带坑可能就变更更更贵了:tishizi:

  • 大家做模拟用MATLAB多吗?

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    P

    @jerry 来的有点晚了,下载不了了。能给个书名吗?谢谢

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    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!

  • 粒子穿过可变形界面的问题

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    凤雏岂能消逝

    @bestucan 真的非常感谢您的建议。对于二维的case尝试了一下,我设置一个不变形的界面,进入filter区域的粒子数量大约是等同于流通量。但我手上的计算资源和代码的优化方面并不乐观,耗时久。如果界面变成可变形的情况,计算时间应该会加倍,时间上等不起。

  • 大家发朋友圈越来越少了

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    @李东岳 这两年的学生真的是过的没劲。。

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    ZY-GONGZ

    @李东岳
    已经看到了,非常感谢您:xiexie:

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    bestucanB

    @李东岳 我就记得我之前搞过,后来坑太深了,就没搞了。

    这些涉及到图形处理的各个层,又是平台不同,又是商业公司夹私货,那些个组件的名字本来就乱七八糟,缩写规则还不一样。想短时间了解就更乱。

    大概就是,可以软件渲染(OSMesa),可以硬件渲染(EGL)。
    其实都是基于Open GL,就这三个英语词空格隔开一起搜都一大堆讲更多术语关系的文章。

    paraview 默认用软件渲染,想要硬件渲染把 EGL 编译选项打开就行了,这就有个忘了打开报错的:
    https://discourse.paraview.org/t/build-paraview-for-nvidia-gpu/8309
    但这个是单GPU的,不知道多GPU的怎么搞,

    我的GPU是当显卡用的,一开paraview就调用GPU,当然是为“图形界面渲染"的,不是为“paraview渲染”的,这俩还都是opengl下面的,那些名词太乱了。

    我试着编了一下 pvserver能多线程跑在GPU上,
    Screenshot from 2022-06-11 15-52-46.png
    就是这个方法:
    https://github.com/Kitware/ParaView/blob/master/Documentation/dev/build.md

    当然编译之前已经安装好nvidia自带的驱动了。

    nvidia 早些年自己出过 paraview 的插件:
    https://www.nvidia.com/en-us/data-center/index-paraview-plugin/
    不过是针对 paraview 5 的

  • CFD和LBM的优劣势

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    C

    @leo_chou 大批量的工业算例(本身可能不复杂,但就是工况多),LBM是不是也需要大规模网格和较长时间?工业应用CFD对时间的要求基本上是小时级别的。

    另外好奇问下,复杂几何下的LBM如何,需要湍流的LBM呢?我觉得大部分案例,复杂几何+湍流模型是标配,没有湍流的话可能有多相或者化学反应啥的,这些LBM是不是会更强一些?

  • Centos7中Ansys Geomagic显示问题

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    bestucanB

    启动的时候在启动命令后面加上后缀试试

    -driver x11
  • cent换清华源

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    李东岳
    sed -e 's|^mirrorlist=|#mirrorlist=|g' \ -e 's|^#baseurl=http://mirror.centos.org|baseurl=http://mirrors.tuna.tsinghua.edu.cn|g' \ -i.bak \ /etc/yum.repos.d/CentOS-*.repo yum clean all && yum makecache
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    李东岳

    这个软件使用的太少了。好像论坛也没什么人可以讨论 :134: