Chapter 365: Grab resources from Dream Company!
The speaker is Song Jian.
And such a big boss actually used the humble term "ask for advice".
Even before asking a question, he raised his hand specifically.
The noodles are full!
In this case, other people in the conference room naturally returned to silence instantly.
Song Jian stretched out his hand to adjust the black-rimmed glasses on the bridge of his nose:
"Xiao Chang, I probably understand the grid generation algorithm you just introduced. The large-scale model surface mesh is used as input, and the surface mesh of the generated tetrahedral mesh is guaranteed to be highly consistent with the input mesh. ”
Although he is not an expert in the field of numerical calculation, he is an expert in numerical calculations. Having worked in the field of control for many years, he obviously has a profound theoretical foundation. It is not difficult to just understand this introduction.
“That’s right.”
"So, for larger-scale projects, will this process take up too much memory and cause the program to be unable to run normally?"
Chang Haonan wanted to say good question at this time.
But considering Song Jian’s age and status, he held it back in the end.
In this era, many so-called "supercomputers" only have 4-8G of memory, which is actually unable to withstand high computing intensity.
Furthermore, it does not mean that a program that requires 8G of memory can be used normally on a computer with 2G of memory by slowing it down four times.
For a specific algorithm, simply reducing the calculation speed will not significantly reduce the memory usage.
But Chang Haonan has naturally considered this issue.
"That's right. It will be mentioned in detail in the document I sent to the research group responsible for this module. When it comes to specific program writing, a multi-level regional decomposition strategy will be used to ensure that the method Specifically, the first level of area decomposition uses planes to divide the three-dimensional area, and the second level uses straight lines to divide the two-dimensional area. Both parts are performed recursively and will be assigned to different processors. "
“From the results of my previous tests, for a supercomputer or server with 8G of memory, provided that the CPU concurrency capability is sufficient, it can handle a grid number of one billion units. As for For more complex structures, you need to wait until the trial version of the software is completed before officially testing it.”
“In addition, for computers with insufficient processors, we will consider providing a downgraded version, of course. For commercial considerations, this version may be named open version or educational version. Its efficiency is about one-fifth of that of the full-featured version, but it is still far more than similar products currently on the market such as OpenCASCADE Technology. And it also has some functions that the latter does not have. ”
"And when the commercial version of the software is released in the future, we will also selectively open purchase rights according to different customer levels."
After this clear explanation, Song Jian nodded with satisfaction. :
“Okay, I have no questions.”
After two hours of high-density information, most of the people present were already quite exhausted. The effect of forcing it to continue would not be good, so Chang Haonan directly announced a tea break.
Of course, due to limited conditions, there are no fruits and snacks.
Really only tea is provided.
But under the current circumstances, no one is in the mood to eat and drink.
Especially the groups assigned to work on the grid generation module started discussions on the spot with the materials Chang Haonan sent them.
Just like taking classes in college, naturally some people will come to Chang Haonan directly.
For example, Yao Mengna and Xu Yang.
The two of them still don't have much psychological baggage.
"Gong Chang, no, Director Chang, Meng Na just put forward an idea. I briefly verified it and thought it seemed feasible."
The latter turned his head in surprise. , looking at Xu Yang and Yao Mengna standing side by side.
It seems that since they came back from Haojing this time, the relationship between them has become much better...
"Junior...Junior brother, that's it. I was with 603 before. At that time, I also participated in a project to adapt turboprop engines to propellers.”
Chang Haonan thought for a while and felt that what Yao Mengna was talking about should be an improved version of the Y8. However, considering that not all people in the conference room were from the aviation system, he did not specify the specific model.
The original Y8 uses a four-blade propeller that is as mediocre as the An12. By the 1990s, it has completely fallen behind the times in terms of propulsion efficiency and noise control.
So in the original timeline, both the Y8 III platform and the Y9 platform were equipped with updated 6-blade propellers.
Although the current development of Yun 8 has been slightly deviated due to Chang Haonan's intervention at the end of last year, when it comes to propeller upgrades, the difference should not be much different.
"Uh... are you encountering difficulties?"
"That's not true. Although I am not as capable as you two, I can still do this kind of small work."
Yao Mengna shook her head angrily,
"I I suddenly thought of it after listening to you just mentioned again the previous idea of converting triangles into pseudo-quadrilaterals. Is it possible to use real quadrilaterals or hexahedral meshes in the process of structured mesh generation? ”
“For example, in the process of designing a new propeller this time, we used a large number of non-uniform rational B-splines and T-splines. In this scenario, the quadrilateral mesh is suitable for spline simulation. It is easier to obtain the tensor product patch than to obtain the Bostein/Bessel basis based on the triangulation network, so it should be more suitable for the modeling of high-order surfaces. ”
Compact. Then, Xu Yang placed a notebook with a page of calculations in front of Chang Haonan and continued to add:
"After she told me about this idea, I did a simple calculation and found that it should be possible to accurately process the quadrilateral mesh through a multi-point flux finite element method based on the lowest-order Brezzi-Douglas-Marini space. The following work It is to establish the theoretical analysis of velocity superconvergence of this method on h^2-consistent quadrilateral grids, but this is not an area I am particularly good at, so I want to see if you have any ideas."
Xu. The calculation process written by Yang was the same as the program Chang Haonan would write when he was first reborn, with a concise and concise statement.
Anyone else might not be able to understand.
Fortunately, Chang Haonan’s current theoretical level is enough to skip some of the less important parts in the middle.
“Forget it, you should take this book first. Anyway, our top priority is to build the framework of the software according to your current thinking. The problem of the quadrilateral grid should be the iterative upgrade process of the subsequent products. It's not urgent yet. It won't be too late to talk to me when you have an idea." Xu Yang looked at Chang Haonan who was bowing his head in thought, and he also knew that this kind of problem in the field of computational mathematics is mainly about the sudden flash of inspiration. So I was in no hurry, so I prepared to take Yao Mengna back to her seat.
In fact, even the grid processing method she proposed is completely new to the field of numerical analysis.
Generally speaking, this takes more time.
Why do large papers in the field of mathematics often take several months or even more than a year to be reviewed?
Because the various new concepts and theories proposed in it are often enough for reviewers to understand for a while.
Sometimes all the reviewers can't understand it, but they can't falsify it, so they can only put it aside for the time being.
However, Chang Haonan stopped them directly from behind:
"Wait, wait, wait..."
"Although the matter of the quadrilateral grid must wait until later. , but I still have some ideas about your theoretical proof."
"You understand it now?"
Xu Yang turned around suddenly, his face full of surprise.
"It's okay, because I have studied the multi-point flux approximation method, so I know a little bit about it, and it is not a zero-level foundation."
Chang Haonan picked up the pen directly from the side:< br>
“You can refer to the super-convergent idea analysis of hybrid finite elements. First, find the interpolation that infinitely approximates the exact solution in the finite element space, and establish the relationship between the interpolation and the exact solution, and then establish the relationship between the numerical solution and the interpolation. Relationship..."
...
At the same time, at the back of the conference room, Song Jian patted Li Jie on the shoulder and motioned for the latter to follow him out.
Under the guidance of several security guards, the two came to a secluded and uninhabited place nearby.
"Li Jie, what do you think the prospects are for Comrade Xiao Chang's project team, and of course the company he will establish later?"
"There are no limits."
Li Jie answered almost without thinking:
"Not only is he an epoch-making leader in technology, but more importantly, I think Comrade Chang Haonan has a very strong ability to lead the overall situation."
This evaluation even far exceeds that of Song Jian He had just expected it, so he became interested instantly:
"Oh? How do you say it?"
Following that, Li Jie gave a rough summary of the situation when Chang Haonan met him a few days ago. Described it once.
“It’s a bit interesting...”
When hearing Chang Haonan express his hope to indirectly promote the application and development of domestic high-performance servers and supercomputers through his work, Song Jian also showed an unexpected expression,
“No wonder Lao Ding is so I attach great importance to it, and have been holding it tight and refusing to let go..."
The second half of the sentence was spoken in a very low voice, and Li Jie couldn't hear it clearly for a while:
"Uh... Director Song, you just said What?”
“Oh, nothing.”
Song Jian waved his hand, then changed the subject and asked quite seriously:
"Comrade Li Jie, what do you think of the reform of the Institute of Computing Technology in recent years?"
This There were some sensitive questions that Li Jie didn't know how to answer for a while.
Since about four years ago, the Academy of Sciences has piloted an enterprise-institution joint approach to entrust the computing institute to the management of Dream Company. This is why the current general manager of Dream Company can nominally serve as the director of the Institute of Computing.
"There are only two of us here. You can say whatever you want without any psychological baggage."
"This..."
Li Jie hesitated.
Some words are definitely not easy to say in public.
But now there are only two of us, Song Jian and myself, so it doesn’t hurt to reveal more:
“Director Song, to be honest, I’m not very optimistic about it.”
"When we are entrusted to Dream Company, it seems that the relationship between the two is closer, but in fact it has little impact on daily work. The funds for the three major projects in the institute still come from state appropriations, regardless of where Dream is. He was not very interested in our technology development or product promotion. Instead, he was very interested in Shuguang Group. He even tested my tone and asked if the vice presidents of both parties could concurrently serve as the deputy general managers of the other company. "
"And you know, because of Academician Ni's incident, Dream Company has been at the forefront of the storm recently, so we have actually taken on some unnecessary pressure..."
" Hmm..."
Song Jian stood in front of a window with his back to Li Jie, so that the latter could not see his expression.
But it was obviously thinking.
After a long time, the former finally looked back:
“After you go back this time, find a few trustworthy comrades to be responsible for communicating with Xiao Chang, and record all relevant situations clearly and clearly. After waiting for a while, we will calculate the input-output ratio."
This order made Li Jie's eyes tremble.
If nothing unexpected happens, next year, in 1998, the Academy of Sciences will make another large-scale organizational adjustment.
Song Jian obviously has new ideas.
(End of this chapter)