Determination of the number of SPH particles

Ovunc2
Ovunc2 Altair Community Member
edited November 2020 in Community Q&A

Hi, 

 

I work sloshing in the basic rectangular tank with the SPH method. I will try to sloshing in a more complex structure in the future. 

 

I'm new to Radioss solver and SPH method. For this reason, there are a few things I would like to consult with you.

 

  1. It is clear that as the pitch size decreases, the number of particles formed increases. Increased number of particles will also increase accuracy and solution time. How is the ideal number of particles determined? 
  2. I can read contact reaction force and pressure in the model I created. But as with the CFD, is it possible for me to read the fluid pressure?
  3. During sloshing, is the value I read from the pressure gauge on the test apparatus the same as the value I read on the contact surface?

 

Thank you for your help

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Answers

  • Rogerio Nakano_21179
    Rogerio Nakano_21179 New Altair Community Member
    edited November 2020

    Hi

    1. More than one particle that would interact with the target surface is recommended. If you can add, e.g, 3 is a good start. The more the better , but will increase the solution time.

     

    2. with SPH you can use /GAUGE/SPH and /TH/GAUGE to estimate the pressure near the tank wall.

     

    3. the pressure would be very close. the more particles interacting with the master segment the smoother the pressure would be at the probing region.

     

    Regards

  • Ovunc2
    Ovunc2 Altair Community Member
    edited November 2020

    Hello @Rogerio Nakano @Rogerio Nakano , 

     

    Thank you for information. It was very useful for me.

    Can we say that as the number of particles increases, the results get closer to a certain value?

    And after a certain number of particles, increasing the  particle number wont effect the simulation results? (which is the case for mesh convergence in FEM analyses)

    In addition, 

    What do you mean as" target surface"? I could not understand the part you mentioned as "If you can add, e.g. ,3 is a good start" . Can you explain a little more? 

     

    Regards, 

    Övünç 

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