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  • FLUENT层流 模型 与 Q-DNS

    Fluent
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    Y

    FLUENT中的层流模型,如果时间步长和网格足够精细,用来计算湍流跟二阶精度的DNS有什么区别呢? 或者说可以用来算Q-DNS吗?

    看到知乎上有讨论,但并没有明确的结论?

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    M

    @bestucan 非常感谢老师的提醒,让网格变稀疏之后发现了两处可疑的质量较差的地方。尝试之后发现,有一些长方体网格划的太瘦了,ICEM的网格质量检查没有问题,修改之后OpenFOAM中就也没有问题了。:huahua:

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    A

    乒乓球带坑可能就变更更更贵了:tishizi:

  • 新版本CFD百科,欢迎测试

    Algorithm
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    李东岳

    IP访问

    注册用户可以自行创建、修订词条,试试看?谢谢

  • 方柱绕流的周期性网格

    Meshy
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    Z

    是否为容差 matchTolerance 太大导致的衔接不上~

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    @李东岳 在 请教各位如何用tecplot360(EX2022R1)处理OpenFOAMv2312中颗粒分布 中说:

    还真是。我刚才看了一下。应该是我的虚拟机上面没有装tecplot,所以没找到tec的头文件。

    dyfluid@dyfluid-virtual-machine:~/OpenFOAM/OpenFOAM-8/applications/utilities/postProcessing/dataConversion/foamToTecplot360$ wmake wmakeLnIncludeAll: running wmakeLnInclude on dependent libraries: wmakeLnInclude error: base directory /home/dyfluid/OpenFOAM/ThirdParty-8/tecio/tecsrc/ does not exist Making dependency list for source file foamToTecplot360.C could not open file TECIO.h for source file foamToTecplot360.C due to No such file or directory could not open file MASTER.h for source file foamToTecplot360.C due to No such file or directory could not open file GLOBAL.h for source file foamToTecplot360.C due to No such file or directory Making dependency list for source file vtkMesh.C Making dependency list for source file tecplotWriter.C could not open file TECIO.h for source file tecplotWriter.C due to No such file or directory could not open file MASTER.h for source file tecplotWriter.C due to No such file or directory could not open file GLOBAL.h for source file tecplotWriter.C due to No such file or directory g++ -std=c++11 -m64 -Dlinux64 -DWM_ARCH_OPTION=64 -DWM_DP -DWM_LABEL_SIZE=32 -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter -Wno-invalid-offsetof -Wno-attributes -O3 -DNoRepository -ftemplate-depth-100 -I/home/dyfluid/OpenFOAM/ThirdParty-8/tecio/tecsrc/lnInclude -I/home/dyfluid/OpenFOAM/OpenFOAM-8/src/lagrangian/basic/lnInclude -I/home/dyfluid/OpenFOAM/OpenFOAM-8/src/finiteVolume/lnInclude -I/home/dyfluid/OpenFOAM/OpenFOAM-8/src/dynamicMesh/lnInclude -I/home/dyfluid/OpenFOAM/OpenFOAM-8/src/meshTools/lnInclude -IlnInclude -I. -I/home/dyfluid/OpenFOAM/OpenFOAM-8/src/OpenFOAM/lnInclude -I/home/dyfluid/OpenFOAM/OpenFOAM-8/src/OSspecific/POSIX/lnInclude -fPIC -c tecplotWriter.C -o /home/dyfluid/OpenFOAM/OpenFOAM-8/platforms/linux64GccDPInt32Opt/applications/utilities/postProcessing/dataConversion/foamToTecplot360/tecplotWriter.o In file included from tecplotWriter.C:26: tecplotWriter.H:39:10: fatal error: TECIO.h: 没有那个文件或目录 39 | #include "TECIO.h" | ^~~~~~~~~ compilation terminated. make: *** [/home/dyfluid/OpenFOAM/OpenFOAM-8/wmake/rules/General/transform:26:/home/dyfluid/OpenFOAM/OpenFOAM-8/platforms/linux64GccDPInt32Opt/applications/utilities/postProcessing/dataConversion/foamToTecplot360/tecplotWriter.o] 错误 1 dyfluid@dyfluid-virtual-machine:~/OpenFOAM/OpenFOAM-8/applications/utilities/posttProcessing/tProcessing/dataCotProttProcessing/dataConversion/foamToTecplot360$

    应该确实是,我看了一下时间,我openfoam-8装的时候电脑上已经有装tecplot2023了。但openfoam-7装的时候没有,也许就是编译记录的Log文件里就没有foamToTec的原因。

  • DEFINE_ON_DEMAND 的循环

    Fluent
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    L

    一个单核代码能出错其实还是不常见的

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    Q

    @yuan_neu 建议看看《张量分析》的相关课程
    二阶 【各向同性】的 【张量函数】 ( Dij(r) )
    只可能是上述 (6.25) 的表达形式

    所以,你首先要明白“张量”,其次再搞清楚“张量函数”的定义,然后需要理解“各向同性”的概念,最后才能明白 6.25 式是怎么推导出来的

    实际上,NS 方程的 Newton 本构关系,也是 “可以” 基于 【线性】和【各向同性】的假设直接写出来的 !

    推荐看看清华黄克智的《张量分析》教材

  • 关于fluent中壁面吸收组分的问题

    Fluent
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    哪位有过类似项目案例经验的朋友,可否赐教一二

  • gmesh划分block

    Meshy
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    liujunCFDL

    请问有前辈知道gmesh如何能划分如图所示得网格吗,图1是图2的block

    block-tuya.jpg model-tuya.jpg

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    ZY-GONGZ

    @李东岳
    已经看到了,非常感谢您:xiexie:

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    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!

  • icem帮助文档

    Meshy
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    K

    @cfd_fly 您好,,有时间可以再分享一下嘛?非常感谢

  • 射流推力计算

    OpenFOAM
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    J

    @李东岳 明白了,谢谢老师

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    Q

    Von Neumann Stability Analysis 在普通的CFD教材里面讲的太简单了
    但是到复杂非线性问题(比如Euler方程)中分析时间推进格式的阻尼特性 (damping characteritics) 的时候就比较复杂
    而且一般期刊文章中只给应用结果而且缺乏细节
    它背后的逻辑是什么,我一直没有搞清楚。。。
    希望有大神能推荐一些详细一点的教材,能把思路讲的比较透彻的

  • [ICEM]如何画出如下的Blocks?

    Meshy
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    Z

    整体划分,然后删除多余的block,看看好用不

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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

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    @ibelief 谢谢,我再看一看。

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    S

    想问下这个职位还招人吗,谢谢!

  • 想问下有从事风工程的同学吗

    CFD彩虹条
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    S

    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!