Lev Leybovich

Unfortunately, I did not expect such a result in any way: yes, the simulation was carried out quickly, on time, but the pictures were issued absolutely without any accompanying text.
The pictures contained rather strange symbols (see attachments) and required explanations, but I did not receive intelligible answers to questions about what these symbols mean and why they look that way.
To get a positive result, I extended the project time, but nothing happened. The performer could not explain what kind of "funny pictures", contrary to common engineering sense, he modeled. In addition, he began to accuse the customer of incompetence and of issuing incorrect initial data. When asked to confirm their words with calculations, a reference was simply made to some sample of the product. But I don't need the finished product! I need a mathematical model exactly for the parameters that I set. If it is impossible to make such a model, then it was necessary to write it, and not to adjust, not to manipulate, the results obtained.
As a result, it is not clear what model he gave me and why it looks that way.
As I already wrote, some data on the model simply contradict
It may well be that the model is correct, but it is not clear what the model is. What are the underlying data? What is modelled? I never received an explanation.
At the end of the argument, there was a feeling that it was not he who modeled, someone helped him (like his students at the department), but he simply took advantage, but could not explain anything on these models.
By the end of our dispute, the performer generally descended to rudeness.