By the way, do you belive in "Bernoulli law" , saying that "High
Airflow velocity causing Low Pressure"?

I believe in the phenomena of decreased internal pressure with
increased stream velocity.


That should mean the the jetblast behind an F-16 Fighter running on
afterburner should create low pressure!

If that were true it should mean that you could put jet fuel in a
container and ignite it and then low pressure will suck the container
into a ball.


But thats not being the case! The total pressure is very high due to
the high dynamic pressure!

And that would be due to the expansion of gases among other things
associated with the combustion of jet fuel.

The Venturi effect you discuss is pure due to "The Coanda effect" and
the turning of the airflow along the walls of the divergentpart of the
pipe!

How local pressure gradients are created by turning the fluidflow you
can read he

Local pressure gradients are created by a solid object and a relative
airflow pushing and pulling on each other. This pushing and pulling is
what turns the relative airflow. Local pressure gradients are a
characteristic of this pushing and pulling not the cause. You got the
horse before the cart. Its like saying cars go fast because of miles
per hour.