CFD中文网

@jacob-z

mpirun --oversubscribe -np 20 xxFoam -parallel

应该是进程超限锁死，需要添加申请允许超限，就可以了

@winsway_zero 前辈，请问gmesh怎么划分block

特征长度弦长

业内基本是公认的单通道多通道对CFD影响很大

不过我还没自己实测过，所以不敢说100%，只敢说98%

还有就是如果网格节点无法保证周期性一一对应，可以将对应的周期面设置为interface,然后到fluent里通过匹配两个interface面，并选择对话框下方的Periodic boundary conditions设置
另外一款网格划分软件Gambit的话就可以直接设置多对周期性边界条件

http://www.sciencedirect.com/science/article/pii/S0167610598002001

看着篇文章：Nevertheless, it should be stressed that from a physical point of view, one should aim at a 3D LES with 2D LES being but a compromise imposed by computer limitations.

最近看到一种说法，level set方程是简化版的相场方程，结合这三种方法在方程形式上非常相似，不知道从计算精度、计算量等方面来讲，这三个方法的优缺点有没有什么对比性结论？

@WeakForm 是的。不管是多大的相分数，是多大的速度。结果都一样

@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:

Data-Create Zone-Rectangular提取出想截取的位置
d2469623-64c0-45c3-952d-a6339a3b560b-image.png
但是提取出来的Zone没有数据，Data-Interpolate根据原数据对创建的Zone进行插值就可以
abd5cf18-caaf-4a49-a528-3b9afd696f35-image.png
这样就得到一个名为Rectangular zone的Zone
758ce629-1262-40bf-83b2-1477d15a474d-image.png

就是下面这个
$$
\frac{\p T_{ij}}{\p x_i\p x_j}
$$
其实$T_{ij}=u_iu_j$，所以演变为
$$
\frac{\p u_iu_j}{\p x_i\p x_j}
$$
这个公式是可以写成$\nabla\cdot(\nabla\cdot(\bfU\bfU))$这种形式，$\frac{\p T_{ij}}{\p x_i\p x_j}$好像写不出来 :134:

大佬们看看？

@random_ran 你说的是什么意思，可以再详细一点吗？这个fluent15.0用了快两年了，从来没出现过这这种问题，就最近算着算着就开始出现connection to the license server has been lost for 7 minuts

@疏影横斜水清浅 自问自答吧，是组合公式
1f3e206f-d460-45ee-9db8-ffeb3cf340df-image.png
C（k，i）

测试编辑

@李东岳 :146: :146: :146: ，谢谢李老师，醍醐灌顶

求问各位，以往的OpenFOAM Workshop 的论文集在哪可以找到？在这个网站里没有呢？https://openfoamworkshop.org/previous-workshops/
我想找一个OpenFOAM Workshop 2016年的一些报告，请问有没有知晓如何获取的？:quwan:

我用openfoam也出现这个问题，有种说法是不可压假设导致的，我还没试过

周期性边界条件主要是这俩个边界的通量一正一负，速度相同。

对称性边界主要是此边界通量为0，边界法向速度为0，只存在切向方向，对称性边界对于标量等于零法向梯度边界。

I want to keep my bike close by, so I can fix it

I want to take off (remove) the bike wheel

Allen key

It doesn't fit

Move over, scoot over, can I get passed, please

She likes more and more like me everyday

I rarely (don't often) watch TV

Why did you set the temperature to 20 degrees

Dont rush me

I want to get rid of the extra oil

I can take some, I will finish what's left

She has a loose tooth, and its goin to fall out

She is not fully awake, she is a bit groggy

She is the one who loves me the most, she loves me the most

Put on the striped onesie

Move forwards and backwards

Her ton nail is broken

This is her first time seeing it

This drink is non-alcoholic, you can have a sip

Take a big step forward

A loose thread

Lift my leg and put it down

Stick out your tongue

She is lying on her side

I did it all in one go

Do you mind if I add her to our chat?

Please comment on the sentences above

Look at the lines on your arm. You leaned against something, that left lines on your arm.

Pull the handle to open the wardrobe

She just wants to be held up one your shoulder, she just wants to be held close to your chest

I am afraid of the dark

When she is sleeping, how does she know who is beside her

She does not care about anything, she is not easily bothered by things, she has high tolerance. I have a high pain tolerance.

If someone's ideas can be easily influenced by others,

She does not want to lean back

Give yourself a round of applause

Candy wrapper

I am meshing the pataya？？？

Are u scared of mosquitoes biting you?

Do you hear me calling you?

Another spoonful

How about I weigh you?

@bestucan hhhh谢谢您，我发现我哪里错了，我画网格的时候是xoz面上的，正确的应该是在xoy画个2D的网格，然后openfoam会在z轴增加一个面。