Chapter 364 A simulation modeling tool that transcends the times!

After this sudden episode, Chang Haonan turned over the blackboard next to him and continued to explain along the same route:

"Because of the various problems faced by traditional methods, in our program, a parallel constrained tetrahedral mesh generation method based on Delaunay-AFT will be used to generate separation layers around the split plane, thereby decomposing the mesh coverage area. .”

"The splitting plane is only used as a guide when generating the separation layer, thus avoiding the introduction of geometric constraints. At the same time, the efficiency of parallel grid generation is ensured through the multi-level regional decomposition strategy; the communication mechanism based on disk cache saves the use of computer memory. use……"

"This process is mainly divided into the following steps. The first is the assessment of the grid size..."

"The second is the introduction of the dividing plane. The dividing plane n can be determined with the help of the main inertial axis with the smallest moment of inertia of the center of gravity of m. The direction vector n of this axis can be determined by the eigenvector corresponding to the smallest eigenvalue of the inertia matrix of M To determine, the calculation method is as follows..."

"..."

Chang Haonan talked about the "most basic" parallel surface triangle/quadrilateral mesh generation method for nearly two hours.

This is just the theoretical part.

"During the preparation of the laboratory, I briefly verified the mesh generation method just mentioned. The test objects were common gear hob models and cylinder head models, with 348 and 2736 surfaces respectively, including There are many kinds of mesh thin surfaces that are difficult to generate using traditional methods. I put the final results here for everyone to refer to."

Chang Haonan clicked the mouse and finally released the last picture of the first PPT——

Because he had so much to talk about, during the previous testing process, the office software, which was still in its early stages, often got stuck and had to be divided into several files to proceed.

"Here, I define the unit mass Q as the ratio of the radius Ri of the inscribed sphere of a unit and the radius Rc of the circumscribed sphere. In order to change the unit mass into an integer as much as possible, the result is multiplied by three, so the final definition of Q =3*(Ri/Rc)”

"It can be seen that compared with the high-precision mesh generated by the traditional method, the mesh generated by the new method does not generate a garbage mesh with a quality of 0.1-0.2 even in dirty areas with extremely complex shapes, and the quality is 0.6- The total proportion of meshes between 1.0 and 91.7 is more than 0.2%, and the weighted average quality is about % lower than the former. This difference will have almost no impact in actual work."

“In terms of final time consumption, although the parallel strategy adds three steps of regional decomposition, grid refinement and node merging compared to the traditional method, due to the greatly improved grid generation efficiency, the total time for the two test models is Only 750 seconds and 2100 seconds respectively, only 5.9% and 4.7% of the serial method respectively..."

When Chang Haonan posted the program running log and told the results, the originally silent conference room exploded almost instantly.

The former also specifically failed to maintain order immediately.

After people suddenly receive information that is far beyond their cognitive level, it always takes some time to calm down.

After all, that is 20 times the original efficiency.

In the field of numerical computing, quantitative changes in time are themselves qualitative changes.

The gear hob and the cylinder head are just two very simple models. It may not make much difference whether the mesh generation takes 20 minutes or 6 hours.

But for some very large engineering projects, there is a huge difference between half a month and a year...

What's more, more careful people can already see that the new method developed by Chang Haonan works better for more complex models.

That is to say, in practical applications, this advantage is likely to be more than 20 times.

Li Jie, who was sitting back and taking notes calmly just now, raised his head almost subconsciously after hearing the two data that Chang Haonan said.

He first raised his head slightly and looked at the curtain hanging on the wall in front of the conference room along the lower edge of his glasses.

According to the enlarged display of the running log above, I heard it right.

That's 20 times.

"This……"

Li Jie turned his head and looked at Song Jian, director of the Science and Technology Commission, who was sitting on his left.

Then he found that the other party was also looking towards him at this time.

As absolute giants in the industry, both of them obviously saw the potential of this software.

Although what Chang Haonan has talked about so far is only about 10% of the entire project, it is enough to give a glimpse of the superiority of the final product.

It is definitely an epoch-making product!

Since my country's first supercomputer Galaxy No. 1983 was put into use in , the main problem that has plagued China's computer field has been the inability to increase its computing power.

It’s not even the turn to discuss component performance issues.

But even if someone else exports the same chips and memory to you, the performance of your final finished product will still be very different.

So much so that the United States has even relaxed its export controls on electronic components in recent years, but has strictly controlled the platform architecture.

All in all...

I don't think you pose any threat.

The actual situation is indeed similar.

The latest Sugon 1000A supercomputer built by the Institute of Computing for the Liaohe Oilfield has a peak operating speed of only about 60 billion operations per second. The Sugon 2000-1, which is currently under construction, has a target of only 200 billion operations.

And ASCI Red, which was just put into use on the other side of the ocean last month, has reached a speed of 1 trillion times per second.

As for mass-produced commercial models like those purchased by major universities, the performance gap is even more obvious.

This gap is also the main reason for the delay in the development of domestic computer commercial applications.

After all, a limited number of topics can fully occupy the computing power of supercomputers. As a result, only the most important national projects can be allocated resources, and most researchers have no experience at all.

Nowadays, although the supercomputing boom brought by Beijing Airlines has alleviated this situation to a certain extent, these commercial servers with average performance often appear powerless when facing complex problems.

If you want to change people's old concepts, you have to actually make people feel the benefits.

At this time, Li Jie recalled in his mind that when he met Chang Haonan a few days ago, the latter also said that supercomputing or server businesses should not be sold, especially in related industries. Underdeveloped China must provide continuous services and promote supercomputer applications.

At that time, he just thought that this idea was very good and would definitely improve some user stickiness. However, the Institute of Computing was currently unable to do this work itself, so he entrusted it to Chang Haonan.

In exchange for the priority use of the future Sugon 2000 computer and the opening of the investment license to Sugon Group.

But he didn't expect that before he even had time to convene the board of directors, the other party had already produced results.

Although there are thousands of fields that require supercomputers, numerical simulation and simulation are definitely one of the fields with the widest range of applications.

Directly improving efficiency by 20 times is equivalent to narrowing the computing power gap between China and the United States from three orders of magnitude to one order of magnitude.

Although it's not a direct overtake, at least you can see the opponent's back.

Moreover, almost all engineering disciplines can benefit from it.

"Comrade Chang Haonan, I have a question to ask."

A steady voice cut through the noise in the conference room.

Almost everyone turned around and looked towards the end of the room.