The military-industrial scientific research system of the academic master.

"In terms of numerical calculations, if we need assistance from our Computing Technology Research Institute, we can also provide some supercomputing resources."

Xu Yang's voice was unfamiliar to everyone except Chang Haonan.

Therefore, Yan Zhongcheng looked at the opposite side and was stunned for a moment before replying:

“It would be great to have supercomputing resources, but the key factor affecting our progress is not the amount of calculation, but the limitations of software functions and algorithms.”

Now Xu Yang was really interested:

"How to say?"

"Although the core parts of aeroderivative gas turbines are readily available, marine gas turbines and aircraft engines are still very different in terms of use environment, performance trade-offs, cost control, etc., so it is not enough to copy them completely."

Because everyone here is his own people, Yan Zhongcheng gave a very complete answer:

"For example, warships will have strict requirements on noise and vibration, especially if anti-submarine is the main mission target, it will be even more stringent, while aerospace engines have relatively smaller restrictions in this regard."

"Another example is that warships may sail in polar cold waters for a long time, and the gas turbine air inlet must overcome the icing environment. However, because jet aircraft are fast enough, there is almost no need to consider this problem."

"This part of the work also involves more than a dozen multi-physics coupling effects such as acoustic vibration, heat, and thermoacoustics. If we want to achieve accurate calculations through current simulation modeling software... on the one hand, it will be very difficult, and on the other hand, considering The current computing speed of our country’s supercomputer may take longer than building a few prototypes according to the old method.”

"And this is only a problem faced in the design stage itself. Good designers need to consider the convenience and economy of subsequent production, maintenance, and repair work during the design process. Because gas turbines are not sensitive to their own weight but are sensitive to life and cost. , so Liming Factory plans to use 1Cr16Ni2MoN martensitic stainless steel to produce blades through hot forging. When designing, we cannot only focus on performance like aviation engines do, but also consider the adaptability of blade size and shape to the process, otherwise it will be There is a problem at the manufacturing plant.”

“During the hot forging process, the interaction between material deformation, heat transfer and structural evolution greatly limits the application of the finite element method in the hot forging process that needs to fully consider the influence of microstructure. It is also a complex multi-physics field. The comprehensive action process..."

Yan Zhongcheng is worthy of being one of the early explorers in the field of computer simulation in China. Although he has been left behind by the times because he has not been exposed to the world's top experience for a long time, he can still organize the work in a clear manner when he really wants to do it. The idea is clear.

This long paragraph first stunned Xu Yang, and then quickly inspired her fighting spirit.

Offering help but not being asked for it was definitely the first time for Xu Yang that a big girl had ever gotten on a sedan chair.

"Although current software and algorithms do not support the simulation of such complex multi-physics fields, there are still many methods that can overcome this problem to a certain extent..."

She thought she could attract the curiosity of others, especially Chang Haonan, by raising this topic.

But everyone seemed to have a mediocre response to this, and the real owner lowered his head and fiddled with his chopsticks unconsciously.

In the end, it was Yan Zhongcheng who took over the topic so that there was no silence:

“I know how to split these problems into ordinary single-field or dual-physics couplings to solve, but this requires a lot of work to model and write codes, and the hard requirements for calculations are not that high. "

"This……"

Xu Yang was a little surprised that the man in front of him who looked to be in his sixties could actually have such ability.

She is actually a very pure person, so she immediately respected Yan Zhongcheng:

"Do you also do research on multi-physics modeling?"

"It's not really about research. These technologies didn't exist when I was studying in the UK, so I didn't learn anything about it."

When Yan Zhongcheng said this, he looked next to Xu Yang:

"Actually, this also requires Comrade Chang Haonan's experience and complete notes left in the previous design improvement work on the turbojet 14. During this period, I took advantage of my position and often took them to read and think about, that is, Gradually I understood something further.”

"Dr. Chang?"

This was somewhat beyond Xu Yang's expectation.

Of course she knew Chang Haonan's level, but it was one thing to be capable, and it was another thing to be able to teach or inspire others.

In fact, the more talented people are, the less good they are at this aspect.

Similar to asking Jordan to be a coach——

You just take off and wait for your opponent to fall before shooting.

Chang Haonan, who was wandering in his mind, suddenly heard someone calling his name, and subconsciously raised his head:

"what happened?"

"I wonder, Dr. Chang, if you have any specific ideas about this type of multi-physics simulation modeling calculations?"

Although the current occasion was not academic enough, Xu Yang still couldn't restrain his curiosity and wanted to hear the other party's thoughts.

On the one hand, they want to communicate with each other, and on the other hand, they also want to see who of the two is better at this aspect.

However, Chang Haonan shook his head directly:

“I don’t have any specific ideas, because the current tools actually only support the simulation of two-dimensional fields. No matter how sophisticated the method is to split the specific problem, many variables will be ignored, and the accuracy of the results can be imagined. There are still many problems to follow. A lot of adjustments must be made based on experimental data and experience.”

When he first heard this answer, Xu Yang felt a little disappointed for a moment.

But her intuition told her that Chang Haonan probably hadn't finished speaking yet.

Sure enough, after a pause, the latter continued;

“For example, the classic phenomenological model that expresses flow stress through hyperbolas, and the high-temperature flow stress model that expresses material parameters as polynomials are purely mathematical models that do not consider the microscopic mechanism in the deformation process of metal materials. The influence of macroscopic deformation parameters such as deformation temperature, strain rate and strain amount on flow stress is known. Therefore, for each material, even if only one of the elemental components changes, it must be started all over again."

“What I was thinking about was whether we could find a way, at least from a physical perspective, to describe the thermal deformation behavior of the same type of material and, further, develop a new tool, I mean a software, to do that. Three-dimensional finite element numerical simulation, for example, establishing a coupled analysis system of deformation-temperature-structure evolution for the martensitic stainless steel just mentioned, so that the effects of deformation parameters on the temperature field, strain field and microstructure field can be studied at the same time without splitting. The impact is obviously more instructive for actual production process design and optimization."

"Ah this..."

For the first time, Xu Yang felt that his thoughts were being thrown away by others.

Just like under the apple tree that influenced physics, while she was still busy picking up apples, others were already thinking about why the apples fell from the tree...