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冷清，我来提个话题吧

冷清，我来提个话题吧# Computation - 科学计算

h*o2002-06-18 07:06

1 楼

大家都是做什么的？互相都了解得多了，可能更有得聊
我的大方向是空间物理，也就是研究日地空间，小方向
就是做模式，模拟各种带电离子在近地电场和磁场作用
下的运动，研究范围是两个到七个地球半径的区域。应
用上，可以帮助了解地面磁场的扰动，跟无线电通讯
有那么一丝关系。另一方面是防止高能粒子击穿人造太
空飞行器或者宇航员。
具体的说，就是用数字方法解离子运动方程。现在搞的
都还是线性的，下一步要考虑self-consistency, i.e.,
带电离子运动同时会改变周围的电磁场，改变的电磁场
反过来又要影响离子运动。考虑了这个以后，问题就有
点复杂了。
说完了，希望能抛砖引玉呀

h*o2002-06-18 07:06

2 楼

I need to solve Vlasov equation. For some kinds of particles, e.g. electrons,
I have to add a loss term at the LHS of Vlasov equation. It may be similar
to your flux eqs. In my case the ambient E and B fields vary with
time as well as with position. And they are also modified by particles'
motion.
I don't know what's your case, and how you make your eqs self-consistent.
What I know is in my area, if electrons and ions move together, e.g.,only
E cross B drift matters, you can treat them as fluid.

w*g2002-06-18 07:06

3 楼

I am working on computational fluid dynamics, mainly incompressible flow.
Numerical technique, such as grid generation, multigrid, hybrid grid are
my research interest. Using these techniques, I calculate the flow and heat
mass transfer in crystal growth process, certainly electromagnetic field is
also included in the model but I am not an expert on that topic.
It seems you guys have as pretty good idea about EM, maybe I will ask you some
questions later on... Let's together make this board more

【在 h***o 的大作中提到】

: I need to solve Vlasov equation. For some kinds of particles, e.g. electrons,
: I have to add a loss term at the LHS of Vlasov equation. It may be similar
: to your flux eqs. In my case the ambient E and B fields vary with
: time as well as with position. And they are also modified by particles'
: motion.
: I don't know what's your case, and how you make your eqs self-consistent.
: What I know is in my area, if electrons and ions move together, e.g.,only
: E cross B drift matters, you can treat them as fluid.

h*m2002-06-18 07:06

4 楼

我们需要求解地震波方程.!!

some
electrons,
and
you).

【在 w*******g 的大作中提到】

: I am working on computational fluid dynamics, mainly incompressible flow.
: Numerical technique, such as grid generation, multigrid, hybrid grid are
: my research interest. Using these techniques, I calculate the flow and heat
: mass transfer in crystal growth process, certainly electromagnetic field is
: also included in the model but I am not an expert on that topic.
: It seems you guys have as pretty good idea about EM, maybe I will ask you some
: questions later on... Let's together make this board more

h*m2002-06-18 07:06

5 楼

我们需要求解地震波方程.同时需要求解大型稀疏矩阵方程,所以需要用到并行计算!!

some
electrons,
and
you).

【在 w*******g 的大作中提到】

h*o2002-06-18 07:06

6 楼

现在做计算的很少不用parallel computing的

【在 h*******m 的大作中提到】

: 我们需要求解地震波方程.同时需要求解大型稀疏矩阵方程,所以需要用到并行计算!!
:
: some
: electrons,
: and
: you).

h*o2002-06-18 07:06

7 楼

这个得要求workstation本身有多cpu吧
这个"算法上想办法"怎么说? 大家讨论讨论

w*g2002-06-18 07:06

8 楼

I dl empire before and it uses FDTD... If you are really interested in
using commercial software, you can try to search soft.jx163.com or
www.taishen.net/soft. Good luck!