SPH BCS modelling

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

Hi George,

 

Thanks for your reply !

 

Yes, I have seen this example and with thelp of this I have Modelld my Test Model also but i dont Understand why SPH-Symmetry Collector Doesn't accepts my Frame-ID this Error comes everytime.

 

I have attached my Model u can check. Thanks !

 

 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    Hi Ashish,

    The reference frame should be fixed. It was done and there were many penetrations in the model which was cleared. 

    Please find the model attached.

     

    <?xml version="1.0" encoding="UTF-8"?>Capture.PNG

     

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  • Ashish_MEXPERT
    Ashish_MEXPERT Altair Community Member
    edited January 2017

    Hi George,

     

    Thanks ! Model is clearly showing Ghost Particles and so SPH Symmetry worked.

     

    But one thing i didin't understand Simulation time should also decrease by using SPH Symmetry Conditions in both cases With and without Symmetry conditions Simulation Time is same as around 50 seconds.

     

    So, can we believe if SPH Symmetry is correctly working ?

     

    Thanks !

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Hi Ashish,

    If there was any modelling errors, that is during defining SPH symmetry, the starter would have shown as errors. And so, I feel its working fine.

  • Ashish_MEXPERT
    Ashish_MEXPERT Altair Community Member
    edited January 2017

    Yes you are right thats its working fine now, i beleive there are no Modelling Errors. 

     

    But what i am asking SPH-Symmetrical Condition Model should have less Simulation time as in comparison to Without Symmetrycal Condition Model. Isn't so ?

     

    My confusion is Both the cases are taking Same Simulation time and due to this SPH-Symmetry Conditions could not be Significant. 

     

    What do you think ?

     

    Thanks !

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Hi Ashish,

    A significant difference you can notice in bigger models. This model is a simple one and I think that's why you are not seeing much difference in the simulation time.

    Rest all looks fine in the model.

  • Ashish_MEXPERT
    Ashish_MEXPERT Altair Community Member
    edited January 2017

    Thanks for your help George ! 

     

    In any of the cases i am still in Dilema of getting wrong Pressure from Inlet to Outlet, i mean the distribution of pressure which you could also have seen also not giving Equal Distribution with its Neighbouring particle.

     

    From my Point of View Velocity Function was defined correctly which i have given constant at Inlet.

     

    Do you have any comments over it ?

     

    Thanks !

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Hi Ashish,

    The pressure distribution and related results depends on how accurately the modeling is done. Ensure that the loading and boundary conditions are correct and theoretically matching with the objective of your analysis. Also please recheck the function defined is correct.

     

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