Particles RDB Collision erractic explosion motion strange movements behaviour

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Hi everyone

I have a Houdini scene where a simple pop particles are supposed to collide
with an rdb mesh object, I have attached the scene file

Here is the video of what is happening:


So what I have is an RBD mesh called “Activator”
and I am emitting particles from this activator object using Source Particle Emitter

What happens is that this mesh activator just falls downwards into the cylinder

and as it comes down, it emits particles after certain frames

As you can see, when this activator falls down and comes close to the cylinder, it seems as if the particles explode or jump crazily when they come into contact with the cylinder mesh
and the motion of the activator itself becomes weird it flies out of the cylinder link a bomb

and yet when i turn off the particle emission, the activator mesh falls well and lands inside the cylinder

So I wonder, is there a setting where I can control the behaviour of the particles
when they collide with the cylinder
so that they do not seem to explode like you see in the video

The particles must just emit from the activator mesh and land inside the tank like sand

Thank you

Attachments:
Anaerobic Bacterial Process - H1 - Activator Falling Inside Tank.hip (2.9 MB)
1.PNG (441.0 KB)
2.PNG (440.7 KB)
3.PNG (444.0 KB)
4.PNG (447.5 KB)

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