d*********r
发帖数: 813 | 1 多谢你提供这么重要的信息。不知你的同事是否知道苏老师具体是在加州哪个城市出事
的。很为苏老师的不幸去世而感到难过。
苏铭德教授是卓有成就的计算流体力学专家。是六十年代被蒋南翔校长誉为“清华一万
个人里才出一个”的尖子学生。毕业后留工程力学系任教。八，九十年代曾赴德国做访
问学者。专长计算流体力学以及湍流的大涡模拟。著有“计算流体力学基础”，“气体
动力学基础”等学术专著。其大涡模拟论文以参考文献的形式被收到Stephen Pope所著
的湍流当代经典教材“Turbulence”一书中。为流体力学学科的发展，做出了他自己的
一份贡献。
苏铭德教授性格开朗豁达，为人谦虚低调。在力学系曾负责流体力学专业核心课程“流
体力学”的本科教学。教过的学生如今应该是桃李满天下。加州那边，应该有不少苏老
师当年教过的学生。
希望加州的校友会能出面帮助苏老师的家属料理后事，给苏老师以应有的哀荣。
security |
|
q**w
发帖数: 782 | 2 http://www.technologyreview.com/view/509106/best-of-2012-chines
Best of 2012: Chinese Physicists Smash Distance Record For Teleportation
The ability to teleport photons through 100 kilometres of free space opens
the way for satellite-based quantum communications, say researchers
Teleportation is the extraordinary ability to transfer objects from one
location to another without travelling through the intervening space.
The idea is not that the physical object is teleported but the information
th... 阅读全帖 |
|
f******d
发帖数: 6361 | 3 所以我好鬼怕坐飞机，最近一次遇到好强既turbulence,真系好惊！！！ |
|
i*****a
发帖数: 7272 | 4 i am driving the fourth car since i came to the states....the turbulent life
/sigh |
|
i*****a
发帖数: 7272 | 5 独立宣言? i had mine when i was 18 by spending a night at a friend;s home
without notice..my mom and i had a big fight before that......very turbulent
teenage years ....now i am telling my mom if i could be a kid again, i
would be a better daughter... |
|
H**7
发帖数: 8624 | 6 I wish I'd had mine at 18 as well. :)
turbulent |
|
f*r
发帖数: 3968 | 7 蝴蝶状的“派碧隆”（Papillon）星云揭示大质量恒星诞生之谜（英文原文）
译：Jack
NASA哈勃太空望远镜对位于N159中的恒星诞生区进行了观测，N159坐落在离我们170
，000光年远的伴星系——大麦哲伦星云中。其中，来自新生大质量恒星的星风奔流着穿
过大星云中的脊状和丝状结构。
译自 哈勃网站（http://oposite.stsci.edu）
A Butterfly-Shaped "Papillon" Nebula Yields Secrets of Massive Star Birth
（Chinese Version）
A NASA Hubble Space Telescope view of a turbulent cauldron of starbirth,
called N159, taking place 170,000 light-years away in our satellite galaxy,
the Large Magellanic Cloud (LMC). Torrential stellar w |
|
f*r
发帖数: 3968 | 8 木星和木卫一的罕见合影（英文原文）
译：Jack
这张照片，展示了1996年7月24日有着火山活动的木星卫星——木卫一正经过木星湍
动的云层的上方。木星上那个醒目的黑点是木卫一的阴影。这个影子的大小与木卫一的大
小（3640公里）相仿，它以每秒17公里的速度扫过木星的上空。
这张照片的分辨率大致为100英里。木卫一上的亮斑是二氧化硫的结晶区。木卫一与
月亮的大小差不多，但是却远了2000倍。
这是哈勃太空望远镜配合伽利略探测器而拍摄的一系列照片。尽管伽利略探测器可以
提供分辨率更高的图像，但哈勃却可以提供伽利略探测器无法看到的紫外波段的照片。
此照片使用宽视场行星照相机2在紫波段拍摄
译自 哈勃网站（http://oposite.stsci.edu）
Rare Hubble Portrait Of Io And Jupiter
（Chinese Version）
This image, shows Jupiter's volcanic moon Io passing above the turbulent
clouds of t |
|
f*r
发帖数: 3968 | 9 再来一个，4.5 inch EQ
The real target was Mars. It was well up in the south by midnight
local time
(0400 UT) and I was glued to the EP for the next hour. Unlike other
evenings, the atmospheric turbulence was minimal, the image was rock
steady,
and even with the 6.7mm EP (135X) the image did not break down. The
SPC was
very prominent, and was bordered by a thin dark gray edge. It appears to
be
getting smaller on successive evenings - or is that just my
imagination?
Other dark gray surface features wer |
|
L***o
发帖数: 502 | 10 biofluid mechanics, CFD, turbulence, mixing, imaging analysis
medical device, FEA
microvascular circulation, stroke and cardiovascular mechanics |
|
j**h
发帖数: 126 | 11 nature.com
Sitemap
Register
Login
Nature
International weekly journal of science
Show searchMenu
Archive
Volume 544
Issue 7648
News
Article
NATURE | NEWS
Sharing
Compass protein attracts heap of criticism
Debate grows over a molecule implicated in animal navigation.
David Cyranoski
04 April 2017
Article tools
PDF
Rights & Permissions
George Grall/NGC
The red-spotted newt and many other animals can somehow sense Earth’s
magnetic field.
For decades, scientists have wondered how animals c... 阅读全帖 |
|
b******r
发帖数: 120 | 12 背景：MSE, Univ of Michigan GPA:3.9/4.0
research 主要是做流体的数值模拟（就是解heat transfer 和turbulence 里面
的微分方程，高精度算法的）
已经工作快一年啦，在公司里面主要也是解微分方程和用c++/Python 做数值模拟
软件开发
目前准备转到Finance上，前辈门觉得我是申请Master of Financial Engineering 好呢
还是申请MBA里面的 Finance/Quantitative 好呢？
谢谢！ |
|
w***e
发帖数: 1331 | 13 如果你是 CFD and turbulent (liquid) mixing expert, 熟练使用 Fluent, 今年夏天
6-8月有兴趣在东部大药厂实习, 请在下周二(Feb. 12)之前站内发信联系我。 |
|
b*******r
发帖数: 62 | 14 hi, thanks for your input. so you believe that without knowledge in
petrophysics, geology and porous media flow, it is very tough for cheme
engineer to work in upstream? so you believe that cheme engineer's role in
upstream is limited in polymer , surfactant flooding or phase behavior
related job?
Is porous media flow a laminar flow type? We cheme engineer have good
traning in fluid transport phenomena, mass, momentum and energy balance,
including laminar and turbulance flow. We know how to de |
|
p**********m
发帖数: 472 | 15 the Reynolds number Re is a dimensionless number that gives a measure of the
ratio of inertial forces to viscous forces and consequently quantifies the
relative importance of these two types of forces for given flow conditions.
到底什么叫inertial forces? 为何reynold 常数可以作为laminar flow 跟turbulence
flow的参数呢? |
|
b*******r
发帖数: 62 | 16 Within the next 20 years or even longer, oil wont be vanishing. The
question is whether it is worth for you to switch to PE. 1)Oil industry has
seen many turbulence of downturns. Once you loose job, will you find job in
other industry? 2) will you enjoy pe study or future work in oil industry?
talk with expert to figure out if you like it. |
|
l*w
发帖数: 646 | 17 DNS is mainly used in fluid mechanics to solve N-S equation.
The one I used to work on is DNS for turbulent flow in channels. |
|
q***l
发帖数: 177 | 18 National Academy of Engineering Elects 66 Members and 10 Foreign Associates
WASHINGTON — The National Academy of Engineering (NAE) has elected 66 new
members and 10 foreign associates, announced NAE President Charles M. Vest
today. This brings the total U.S. membership to 2,254 and the number of
foreign associates to 206.
Election to the National Academy of Engineering is among the highest
professional distinctions accorded to an engineer. Academy membership
honors those who have made outstand... 阅读全帖 |
|
g******6
发帖数: 782 | 19 http://www.nae.edu/56154.aspx
National Academy of Engineering Elects 66 Members and 10 Foreign Associates
WASHINGTON — The National Academy of Engineering (NAE) has elected 66 new
members and 10 foreign associates, announced NAE President Charles M. Vest
today. This brings the total U.S. membership to 2,254 and the number of
foreign associates to 206.
Election to the National Academy of Engineering is among the highest
professional distinctions accorded to an engineer. Academy membership
honor... 阅读全帖 |
|
w*******g
发帖数: 99 | 20 No, my work is focused on patched grids. This main application is for material
processing and other laminar and turbulent heat transfer and fluid flow problems |
|
m******o
发帖数: 2 | 21 It depends on the problem you are solving. If the partial differential
equation itself is unstable (say turbulence, molecular dynamics), then even
the very tiny difference of machine truncation errors will eventually give you
very different answers. However, the statistical quantities(such as
correlation coefficients) should remain the same.
编译 |
|
f****r
发帖数: 27 | 22 DNS? You may need Earth Simulator. :) OK. Just kidding.
The requirement of computational facilities really depends on what
you are going to solve. As for the case of DNS, a rough estimation
of grid nodes is propotional to Re^{9/4}. Meanwhile, you time
step should also be small enough to resolve the smalles time
scale in the turbulence flow field. Therefore, if the Re of target
flow field is not very high, such a machine might be OK. However,
the solution may hardly be meaningful, 'coz the work's |
|
t*****o
发帖数: 74 | 23 UCLA has a korean prof. Kim
which is the editor of Jounal of Fluid Physics, big Niu
on the website of ucla, seach CFD or turbulence.
Also there is one Chinese prof.
And in mathematics dept, one Chinese big niu too |
|
f****r
发帖数: 27 | 24 If you are talking about turbulence simulations, just go buy a laptop and
try to get an account from those supercomputer center. If you can get
an account from earth simulator, that would be great! :) They are doing
4000^3 DNS now. hoho |
|
t****n
发帖数: 39 | 25 Flow around cylinder is quite complex. The characteristics around the cylinder
can be affected by the incoming flow rate, diameter of the cylinder,
viscousity of the fluid, and, in your case, the movement of the cylinder.
Assume the cylinder is stagnant, the wake flow behind the cylinder could
vary from symmetric steady flow, to assymmetric steady flow, to
unsteady laminar flow and finally transient to turbulence (with the increasing
of incoming flow velocity) . No simple solution. |
|
ay
发帖数: 2267 | 26 sorry. chombo
我有时候搞搞turbulence
所以mhd也是免不了的 |
|
|
h*******s
发帖数: 11 | 28 You will at least need to understand steady and transient multidimensional
viscous incompressible flow (Navier-Stokes flow), and on top of that you
add Reynolds stresses the concept of eddy viscosity, then you can begin
to understand and use the simplest turbulence models. |
|
s**i
发帖数: 381 | 29 no. Everything in turbulence is deterministic by nature. it is just the
nonlinearity makes it look like "random".
The so-called nonclosed terms come after the averaging, but that is called
the
RANS model, no longer N-S any more. |
|
j**u
发帖数: 6059 | 30 ☆─────────────────────────────────────☆
fingerdance (HappyMan) 于 (Tue Jul 17 18:24:59 2007) 提到:
我编了个湍流程序，想找些实验数据来验证，很多文章上的图表不能直接用，我发
Paper的话用不了啊。。。。
☆─────────────────────────────────────☆
seki (瓜金) 于 (Tue Jul 17 19:11:38 2007) 提到:
turbulence DNS?
I don't think you will be able to get a perfect match with any experiment.
Also there are softwares to read in the graph data from papers.
☆─────────────────────────────────────☆
fingerdance (HappyMan) 于 (Tue Jul 17 20:08:54 2007) 提到:
如 |
|
e*******7
发帖数: 922 | 31 俺穷，不过俺保证，一定有人替俺给，哈哈。
Renormalization group analysis of turbulence I. Basic theory
Source Journal of Scientific Computing archive
Volume 1 , Issue 1 (December 1986) table of contents
Pages: 3 - 51
Year of Publication: 1986
ISSN:0885-7474
Authors Victor Yakhot
Steven A Orszag
Publisher Plenum Press New York, NY, USA
下面是链接http://portal.acm.org/citation.cfm?id=20716 |
|
k*********g
发帖数: 791 | 32 got it？
本来藕也做 free surface的；
觉得那个东西，从 scientific computing 的角度看，是非常高档的；
藕已经首次推导出了正确的ale formulation；
in other words，你们在 literature上看到的那种的所谓的ale是错的；
错误的ale 只能达到1阶精度；正确的可以达到2阶、3阶、。。。精度；
藕原本想接着做 level set 的，把 ale 跟 level set 结合起来（站在2009年的角度
看，这种结合还没有）； 用来求解：
compressible combustile turbulence；
但是，机械工程博士毕业前夕，藕突然迷上了理论物理、粒子物理、天体物理，所以，
以后数值计算只能挑挑拣拣地做了，很挑战性的 moving boundary problems只好留给
别人了； |
|
j****x
发帖数: 943 | 33 最近觉得牛的是交叉,比如stabilization, forecasting, control and optimization
of multiscale PDE systems.具体例子 control of UAV, weather prediction using
aerosondes etc. 感觉得把流体力学，turbulence搞清，inverse problem, 非线性控
制搞懂，还的搞个大规模并行运算，真不是人干的活。如果一个人能全搞得比较明白，
那就是牛的很。 |
|
c********y
发帖数: 98 | 34 I think the "face" issue here is actually more profound than the brand name of
a commercial product. I'm talking about this with a view of China's national
mentality/psychy.
We have been a psychologically very unhealthy nation for a long time, due to t
he terrible and turbulent experiences of the past one and half century. As a r
esult, many Chinese (we included) have a "superiority-complex and inferiority
status" problem: at the bottom of our heart we think we are a great nation, bu
t in realit |
|
i****4
发帖数: 1906 | 35 W. Erwin Diewert, Takanobu Nakajima and Alice Nakamura, Emi Nakamura and
Masao Nakamura: Returns To Scale: Concept, Estimation And Analysis Of Japan
’S Turbulent 1964-1988 Economy
Canadian Journal of Economics
Alice Nakamura, Emi Nakamura and Masao Nakamura
母亲 女儿 父亲
一开始还以为是韩国教授那种paper动辄就是Kim,Kim and Kim。。。。
结果搜了一下发现还真是一家。。。
上阵父子兵。。 |
|
W***n
发帖数: 11530 | 36 It's a turbulance time, but also a time for opportunities... |
|
g******u
发帖数: 3060 | 37 you got ferromagnetic ions inside your body, always some turbulent formed by
interaction with moving electromagnetic field, hard to tell what's the
effect.
But if you are in EE, it's nothing you can avoid. |
|
y*****u
发帖数: 224 | 38 Graduate Programs in Earth Sciences at Florida International University
Two teaching assistantships are available in the Department of Earth
Sciences at FIU for MS and PhD students starting their graduate studies in
Fall 2007.
The students will work with Dr. Ping Zhu on researches focusing on hurricane
boundary layer turbulence structures, atmospheric convection, atmospheric
boundary layer and clouds, and cloud-climate feedbacks. You can find Dr. Zhu
’s information at http://www.fiu.edu/%7Ezhup/ |
|
g****g
发帖数: 8 | 39 Positions for
Ph.D graduate students on
Optical nanoscopy for micro/nanofluidics, cellular imaging and
nanofabrication
Highly motivated applicants with strong experimental background in optics
are invited to apply for two Ph.D graduate student positions for
experimental research. We are developing a novel multifunctional far-field
optical nanoscopic system using two tunable femto lasers for the high
resolution measurement of flow velocity (for research of slip flow and micro
electrokinetic t... 阅读全帖 |
|
|
t*******y
发帖数: 637 | 41 numerical simulation of turbulent boundary layer flow
u know :) |
|
t*******y
发帖数: 637 | 42 【 以下文字转载自 Japan 讨论区 】
发信人: tennisboy (hehe), 信区: Japan
标 题: paper help
发信站: BBS 未名空间站 (Thu Aug 28 00:51:15 2008), 转信
是日本人的文章我们学校没有买这个期刊
不知道哪位xdjm可以帮忙找一下
Ishihara, T., Hibi, K. (2002) Numerical study of turbulent wake flow
behind a three-dimensional steep hill.
Wind and Structures, Vol 5
pp317-328
可以发到我的邮箱 w********[email protected]
多谢 |
|
y*****u
发帖数: 224 | 43 Graduate Programs in Earth Sciences at Florida International University
Two teaching assistantships are available in the Department of Earth
Sciences at FIU for MS and PhD students starting their graduate studies in
Fall 2007.
The students will work with Dr. Ping Zhu on researches focusing on hurricane
boundary layer turbulence structures, atmospheric convection, atmospheric
boundary layer and clouds, and cloud-climate feedbacks. You can find Dr. Zhu
’s information at http://www.fiu.edu/%7Ezhup/ |
|
c*****e
发帖数: 238 | 44 A very interesting question proposed in de Gennes book, soft matter and hard
science(maybe not accurate as I read the chinese translation) is as follows:
The polymer solution is usually viscous and the dissipation is more pronounced
than the pure solvent, but this is verified only for laminar flow when the
Reynolds number is not too large. Experiments show that adding very few polymer
chains to the turbulent flow can effectively reduce the energy loss in the flow
he gave the example that adding |
|
j****x
发帖数: 943 | 45 正在看一哥们写的turbulence，他说randomness 就一定是stochastic，但
deterministic的
方程也能出一stochastic的解,靠谱吗？ |
|
B********e
发帖数: 10014 | 46 首先，很多人做的科学工作是证明一些东西，
而不多的人是在做奠基性的东西：提出新的理论，
新的方向，新的研究方法。后者的难度，在一个
理论蒙昧时期，是可想而知的。
老柯是天才的后者。
偶只因为学stochastic process和turbulence
接触他的东西，这两个方向他都有奠基性的工作。
另一个方面是，他应该是这个世界上拥有最多
大师级学生的人吧。
其他的，你就得看他的wiki介绍了。 |
|
g****t
发帖数: 31659 | 47 动力系统他也算是奠基性的.
至少在苏联这边肯定算.
首先，很多人做的科学工作是证明一些东西，
而不多的人是在做奠基性的东西：提出新的理论，
新的方向，新的研究方法。后者的难度，在一个
理论蒙昧时期，是可想而知的。
老柯是天才的后者。
偶只因为学stochastic process和turbulence
接触他的东西，这两个方向他都有奠基性的工作。
另一个方面是，他应该是这个世界上拥有最多
大师级学生的人吧。
其他的，你就得看他的wiki介绍了。 |
|
h****l
发帖数: 7290 | 48 turbulence is not chaos, hehe |
|
a*******n
发帖数: 26 | 49 请教一下那位大侠知道那里可以找到source code for simulation of turbulence flow
in pipe (wall-bounded).
bow! |
|
