Postion dependent force on certain particles

Mr. Sujit

Hi All,

We are looking to apply a position dependent force on particles belonging to certain bulk material. The forces look something like this:

Fx = 3x + 4y

Fy = 4x - 3y

Any guidance as to how we can incorporate such forces would be very helpfull

Regards,

Sujith

RWood

Hi,

Using the API this should be pretty simple.

If you need the force within a contact model then you can get access to a particle's position with element1.position.getX() and element1.position.getY(). It's the same for the second particle only with element2 instead.

If you want it as a body force it's the same but using particle.position.getX(), etc.

 

If you're unfamiliar with the API then I'd recommend going through the tutorials first to understand where the above fits in:

https://community.altair.com/community?id=kb_article&sysparm_article=KB0037689

That's the first tutorial and you can find the rest in the same location.

Cheers,

Richard

Mr. Sujit

Richard Wood_20774 said:

Hi,

Using the API this should be pretty simple.

If you need the force within a contact model then you can get access to a particle's position with element1.position.getX() and element1.position.getY(). It's the same for the second particle only with element2 instead.

If you want it as a body force it's the same but using particle.position.getX(), etc.

 

If you're unfamiliar with the API then I'd recommend going through the tutorials first to understand where the above fits in:

https://community.altair.com/community?id=kb_article&sysparm_article=KB0037689

That's the first tutorial and you can find the rest in the same location.

Cheers,

Richard

Hi Sir,

 

If we want to incorporate these forces in a contact model, can we apply the forces in the global directions? We did some trial and error and realized that forces can only be applied in the contact normal and contact tangential directions.

Regards,

Sujith

RWood

Mr. Sujit said:

Hi Sir,

 

If we want to incorporate these forces in a contact model, can we apply the forces in the global directions? We did some trial and error and realized that forces can only be applied in the contact normal and contact tangential directions.

Regards,

Sujith

Within a contact model you an only add forces through the contact (normal and tangential force components). If you wish to apply an arbitrary force in global coordinates then you will need to apply a particle body force (PBF) instead. Since PBFs apply for all particles at all timesteps, you'll need to think carefully about how you want to apply the forces.

Richard

Mr. Sujit

Richard Wood_20774 said:

Within a contact model you an only add forces through the contact (normal and tangential force components). If you wish to apply an arbitrary force in global coordinates then you will need to apply a particle body force (PBF) instead. Since PBFs apply for all particles at all timesteps, you'll need to think carefully about how you want to apply the forces.

Richard

Sir, Thank you for the help, we will try to use the PBF to apply the forces.

 

Regards,

Sujith