Particle tracing and Re
 

Hello all,

I have two questions waiting for suggestions please.

1. I like to put a particle at the inlet boundary and see it's tracing line, but I don't know how can I create a particle and put it in that location.

2. I simulated the flow in a stirred tank. After running the program, relevant Reynold's numbers were reported. Could anybody explain how CFX compute the Reynold's number.

Thank you in advance for all kind answers.

Jackie.

Re: Particle tracing and Re
 

I think you can track a particle in Post by plotting a streamline...

Re: Particle tracing and Re
 

Hello zdong,

Did you mean I just simulate stirred tank as one phase flow and put a particle in the tank later?

Can I simulate them as a multiphase flow?, and how can i input a parameter of a particle? such as density, size, number of particle, volume fraction ,or initial location et al.,

Jackie

Re: Particle tracing and Re
 

Are you using CFX4, 5.5.1 or 5.6 ? Particle tracking is now included in CFX5.6 not in CFX551 bob

Re: Particle tracing and Re
 

Thank you bob, I allready have CFX5.6.but I still have no idea how to do that . Could you give me some idea?

Thank you very much, Jackie

Re: Particle tracing and Re
 

In cfx5 you can add a point (Create\Point...\), and then create a streamline that uses that point(Create\Streamline\ Locations:Point 1) as a start.

Michael Bo

Re: Particle tracing and Re
 

That is exactly the way I said... But I have not tried multiphase flow...

Re: Particle tracing and Re
 

Hello,

Streamlines correspond to particles of zero mass. If you want to simulate particles with non-zero mass use the Lagrangian Particle Tracking as described in the new "Butterfly Valve" Tutorial of CFX5.6.

Chris

Re: Particle tracing and Re
 

My understanding is that you were not able to put the particle in the command file and track it in the flow. in order to do that, you can refer to one of examples of particle tracking of CFX4-4 (i am not sure what examples are available in CFX5). If you have further questions, I will give some details. good luck