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@hurricane007 DPM对每个离散的粒子(或者计算颗粒)求解基本的动力学方程,也只能算是介观尺度仿真,of中的DPMFoam稍稍借鉴了写DEM方面的理论,可以简单考虑颗粒尺度的碰撞/旋转等等,应用于大规模计算的主要限制因素就是计算速度(计算颗粒思想的提出对降低求解的自由度有一定的帮助,但感觉在实际应用过程中缺乏完善的设定标准),拉格朗日体系下求解的颗粒粒子与欧拉体系下的空间离散网格数量相比,求解量仍是相当大的,颗粒位置更新算法、碰撞检索效率都有待提升,MPPIC在碰撞计算方面,通过模型模化大大提升了稠密气固两相流的计算效率。大规模应用,高效、快速、稳定的算法亟待出现。
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@hurricane007 谢谢您的回复。我用过一段时间的MPPICFoam,但是遇到了瓶颈。目前打算用cfdem。我们有超级计算机集群资源。
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@hurricane007 谢谢谢谢!赞赞赞
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@minzhang BTW,推荐两个论文,希望对你有帮助
"Towar constitutive models for momentum, species, and energy transport in gas- particle flow"
''Reflections on mathematical models and simulation of gas‐particle flows"
论文:http://dc.engconfintl.org/cfb10/2/
PPT https://www.princeton.edu/cbe/people/faculty/sundaresan/group/presentations/Sundaresan_CFB10.pdf -
@hurricane007 您目前采用什么求解器算呢?cfdem?还是自己开发
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@hurricane007 谢谢谢谢!您是做什么领域的?
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@hurricane007 了解了,你们做哪个方向
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老师您好,我想请教一个问题,我按照CFD Online 上关于 coalCollidingChemistryFoam的讨论,在OpenFOAM5.0 的coalChemistryFoam中添加碰撞模型,但是编译之后出现了下面这样的错误,是不是CFD Online上的方法不适用于OpenFOAM5.0?还是有其他需要修改的地方?
wmakeLnInclude: linking include files to ./lnInclude could not open file surfaceWriter.H for source file coalParcel/makeCoalParcelSubmodelsAdd.C due to No such file or directory could not open file makeParcelHeatTransferModels.H for source file coalParcel/makeCoalParcelSubmodelsAdd.C due to Too many open files could not open file makeReactingMultiphaseParcelCompositionModels.H for source file coalParcel/makeCoalParcelSubmodelsAdd.C due to Too many open files could not open file makeReactingParcelPhaseChangeModels.H for source file coalParcel/makeCoalParcelSubmodelsAdd.C due to Too many open files could not open file makeReactingMultiphaseParcelDevolatilisationModels.H for source file coalParcel/makeCoalParcelSubmodelsAdd.C due to Too many open files could not open file makeReactingMultiphaseParcelSurfaceReactionModels.H for source file coalParcel/makeCoalParcelSubmodelsAdd.C due to Too many open files In file included from /public/software/apps/openfoam/OpenFOAM-5.0/src/lagrangian/intermediate/lnInclude/FacePostProcessing.H:182:0, from /public/software/apps/openfoam/OpenFOAM-5.0/src/lagrangian/intermediate/lnInclude/makeParcelCloudFunctionObjects.H:31, from coalParcel/makeCoalParcelSubmodelsAdd.C:27: /public/software/apps/openfoam/OpenFOAM-5.0/src/lagrangian/intermediate/lnInclude/FacePostProcessing.C:29:27: fatal error: surfaceWriter.H: No such file or directory #include "surfaceWriter.H" ^ compilation terminated. make: *** [Make/linux64GccDPInt32Opt/coalParcel/makeCoalParcelSubmodelsAdd.o] Error 1
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@熊咔咔 我大概回答一下,如果不对期待大家指出
OpenFOAM里面是把particle打包在parcel里面了的,但是如果 1 particle/parcel 就和particle没有本质区别。
parcel是一个打包的概念,把多个性质差不多的颗粒打包成一个来追踪,减少计算量,其直径是等效直径,比如 n particles/parcel, 直径是 (nd)^(1/3),但是particle force 是 nF。正常来讲最大n particles/ parcel 的这个n应该是小于最小cluster包含颗粒数量。如果原先用1particle/parcel 计算需要的时间是T,用parcel 的 n particles/parcel,假设总颗粒数量是 N,那么追踪的parcel数量减少到N/n,需要的时间可以粗略估计为是 T*(n/N)^0.5