Chapter 999 You win, win, win, and finally lose everything
Jameson had a terrible conjecture in his mind.
That is, the algorithm he designed, and of course the COMSOL 2.5 version software developed based on it, has bugs when numerically solving certain types of viscoelastic constitutive equations.
This bug should be so unpopular that even he himself doesn’t know about it.
But Chang Haonan knew.
Moreover, I already knew it.
If this is really the case, then...
The entire competition is just a round.
A game that has been set up.
In the preliminary round, two questions were selected that were most advantageous to COMSOL and did not involve viscoelastic constitutive equations, allowing the participating teams using COMSOL software to achieve results far beyond expectations.
This is equivalent to lowering their vigilance and luring the enemy deeper.
The final is the real killer move.
Two-phase flow calculation, pure CFD problem.
It seems that COMSOL still takes advantage.
But as long as that BUG can be triggered, the results of all teams using COMSOL can collapse.
It may even be impossible to achieve results at all!
Of course, if we want to explain this chain of thinking clearly, it will take at least ten minutes.
That’s why Jameson asked Hermia to see the calculation results without saying anything.
If everything is normal, it proves that his worries are unfounded.
As for bugs, even if they exist, they can be fixed slowly.
And if the result cannot be calculated, or there is obviously something wrong with the result...
then there is no need to consider BUG for the time being.
Just prepare for public opinion and public relations...
...
Professor Jameson didn’t even know how he got out of the elevator.
When he came back to his senses, he found himself sitting on the sofa at the front desk of the hotel.
He didn't think too much and quickly touched his pocket, only to find that he didn't have his cell phone with him.
So he hurriedly rushed to the front desk, borrowed the landline and dialed Heltz’s phone number...
At the same time, Hermia also hurriedly returned to the computer room,< br>
Although she was still confused, Jameson's abnormal behavior just now made her understand that the situation should be very serious.
Sure enough, when she pushed open the compartment door, she found the other two people sitting in front of Unit 3 with livid faces, as motionless as two statues...
"Lemy?"
“Qiao?”
She called twice tentatively.
Hearing Hermia's voice, Lyles's body swayed slightly, and then he turned his head stiffly like a robot:
"Hermie, I think we... are in trouble."
Hermia, who had already had an ominous premonition, suddenly twitched the corner of her mouth, and her heart sank:
"What exactly? What’s going on?”
He walked back to his own machine No. 3.
On the screen is the calculation she started before going to rest.
Now, the results have come out as she expected.
But not completely.
Because...
"Calculating divergence?"
Hermia also showed a ghostly expression:
"How is that possible?"
The computer room was eerily quiet for a time.
Only the faint squeaking sound of the hard drive occasionally sounds.
"Actually... this is our second calculation."
George replied in a hoarse voice:
"At three o'clock in the afternoon, the results of the calculation before you left had already diverged."
"Later, we adjusted the boundary conditions and starting point and tried again, and the result...still diverged."
A problem may be caused by accidental factors or simply careless input errors.
But if the same problem occurs twice in a row, there are only two possibilities.
Either there is something wrong with the method.
Either there is something wrong with the tool.
But...
This is actually not important anymore.
Because it is already the evening of the second day.
There are only 15 hours left to submit your answer.
Compared with those teams that discovered problems early and reworked early, they didn't even have the chance to start over and deliver a semi-finished product.
Liles's face was terrifyingly ugly——
Just a few hours ago, he was condescendingly judging other participating teams that were in trouble, as if he was staying out of the situation.
However, when the same situation happened to him, he found no warning.
Let alone think of a solution.
"Hermie." A few minutes later, Lyles finally came back to his senses and looked at Hermia behind him:
"Go to Professor Jameson and see if he has a solution... …”
“…”
Hermia thought about Jameson’s performance just now and felt that the possibility was probably very small.
The professor must have just realized something was wrong.
It is impossible to think of a solution in an instant.
Besides, even if you think about it, you may not have time to change it.
And George next to him was a little hesitant:
“According to the rules of the competition...”
"Don't worry about that!"
Liles roared:
"After solving the problem, at least submit a valid result!"
" Besides, if you just ask the professor for ideas and don’t bring storage equipment, the competition won’t be able to find it..."
He tended to abide by the rules before because he felt that he had great advantages, and he could get good results even if he abided by the rules. score.
But now that he is at a disadvantage, he has naturally forgotten those things long ago.
Hermia hesitated for a moment, then turned around and ran out again...
However, the result was similar to what she had expected.
When he heard Hermia say that their calculation results were divergent and could not converge no matter how they adjusted the input settings, Jameson was silent for a long time.
In the end, I just sighed.
As for Heltz next to him, he slumped down on the sofa.
In fact, it stands to reason that if a bug occurs in something like software, or it is an unpopular bug that no one has reported for half a year, it should not be a big deal at all.
But the problem is that in the month between the preliminary rounds and the finals, he created a lot of momentum.
Now even the awesomeness has been blown out.
The top three guaranteed funds have also received loans.
Everyone is waiting to see your dazzling performance.
It turned out to be a failure.
That’s a pure clown.
All previous publicity, all intentional or unintentional belittling of Torch Group, and even all intended orders.
They all turn into boomerangs, piercing themselves in the head one by one.
Anyone who has been in the rice circle knows this truth.
The most terrifying backlash is called turning from pink to black...
No matter how you explain it, you can't change the fact that COMSOLM Multiphysics is embarrassed and thrown out of the horizon in public.
Every user will think about what happened in this competition before using it.
And this is not even the most embarrassing thing——
Two days later, the entire industry will know that the bug that COMSOL did not even discover has been solved by Torch Group...
This kind of negative effect cannot be eliminated in just a few years. .
Considering the development speed of Torch Group and the entire numerical computing industry, a few years later...
Laughing to death, who still remembers who you are at COMSOL?
“Professor, is there really nothing you can do?”
asked Hermia, who was still a little unwilling to give up.
Jameson closed his eyes in pain and shook his head.
After a while, he finally explained:
“At present, we can only confirm that the problem should be in the process of solving the viscoelastic constitutive equation, which represents the stability of elasticity. After increasing to a certain critical value, the numerical solution will produce non-physical oscillations in the area of rapid stress changes, causing the algorithm to become unstable and the calculation to collapse."
"But why does this happen... It probably takes some time. It will take two days to find out.”
Why can we find out in two days?
Because Chang Haonan has to give a report in two days...
You will naturally know after listening to it.
Of course, Jameson did not say this.
However, for Hermia, the result is already clear——
Even the cause cannot be found, and the solution is even more fanciful.
She didn't stand still and sat directly on the bed:
"Then...then our final result is..."
No one answered.
Finally, it was Jameson who connected with this sentence:
"Don't worry...I will help you bear the cost of this trip to China..."
This sentence is almost an admission in disguise.
Nothing can be done.
Wait to die.
Hermia, who was sitting on the bed, opened her mouth.
She really wanted to say that the three of them came to China not for tourism, so what was the use of paying for the travel expenses...
But in the end, looking at Jameson and Heltz who were also lost, she swallowed these words. Back in the stomach...
"I know..."
Hermia supported the edge of the bed and stood up again unsteadily:
"I'll go and find out the situation. Talk to them both..."
(End of this chapter)