Effect of pressure on joint cascade of kinetic energy and helicity in compressible helical turbulence | |
Yan Z(闫政)1,2; Li XL(李新亮)1,2; Wang JC(汪建春)3; Yu CP(于长平)1,2 | |
发表期刊 | PHYSICAL REVIEW E |
2019-03-27 | |
卷号 | 99期号:3页码:11 |
ISSN | 2470-0045 |
摘要 | Direct numerical simulations of three-dimensional compressible helical turbulence are carried out at a grid resolution of 1024(3) to investigate the effect of pressure, which is important for the joint cascade of kinetic energy and helicity in compressible helical turbulence. The principal finding is that the pressure term of the helicity equation [defined as Phi(H) = p partial derivative(i)(omega(i)/rho)] has a smaller effect on the helicity cascade in the aspect of amplitude and a smaller effective range, which leads to a longer inertial subrange of the helicity cascade, in contrast to a kinetic energy cascade. In addition, we also find that the effective range of Phi(H) is concentrated only in large scales statistically, which is similar to the effect of the pressure term of the kinetic energy equation (defined as Phi(E) = p partial derivative(i)u(i)). From the overall sense of the effect of Phi(E) and Phi(H) on the kinetic energy and the helicity, respectively, both of them play a role of dissipation especially in the compression region. We propose that high enough helicity can affect the process of energy transformation between kinetic energy and internal energy, which means that the absolute local helicity hinders the process of kinetic energy transferring to internal energy, and promotes internal energy transferring to kinetic energy. In addition,Phi(H) plays a source role both for positive and negative helicity. We also study the mechanism of cancellations between compression and rarefaction regions, and we find that the impact of a shocklet on the helicity cascade can be ignored statistically. |
DOI | 10.1103/PhysRevE.99.033114 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:000462924200009 |
关键词[WOS] | DYNAMICS ; SCHEMES |
WOS研究方向 | Physics |
WOS类目 | Physics, Fluids & Plasmas ; Physics, Mathematical |
资助项目 | National Natural Science Foundation of China (NSFC)[91852203] ; National Natural Science Foundation of China (NSFC)[11472278] ; National Key Research and Development Program of China[2016YFA0401200] ; Science Challenge Project[TZ2016001] |
项目资助者 | National Natural Science Foundation of China (NSFC) ; National Key Research and Development Program of China ; Science Challenge Project |
论文分区 | 一类 |
力学所作者排名 | 1 |
RpAuthor | Yu, Changping |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/78925 |
专题 | 高温气体动力学国家重点实验室 |
通讯作者 | Yu CP(于长平) |
作者单位 | 1.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China |
推荐引用方式 GB/T 7714 | Yan Z,Li XL,Wang JC,et al. Effect of pressure on joint cascade of kinetic energy and helicity in compressible helical turbulence[J]. PHYSICAL REVIEW E,2019,99,3,:11. |
APA | Yan Z,Li XL,Wang JC,&Yu CP.(2019).Effect of pressure on joint cascade of kinetic energy and helicity in compressible helical turbulence.PHYSICAL REVIEW E,99(3),11. |
MLA | Yan Z,et al."Effect of pressure on joint cascade of kinetic energy and helicity in compressible helical turbulence".PHYSICAL REVIEW E 99.3(2019):11. |
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