Applying initial condition

kavehkaveh
in DualSPHysics v4.2
Deal all

Does anybody know that how can I apply an initial condition to a set of fluid particles? I noticed Case4 where an external force varying by time is applied to the fluid particles. But I want to apply initial velocity, acceleration and pressure which vary with the position of particles (both in X and Z coordinates), for example as a cosine function.

regards



Comments

  • zweihuehnerzweihuehner


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    Applying initial condition

    kaveh
    Deal all

    Does anybody know that how can I apply an initial condition to a set of fluid particles? I noticed Case4 where an external force varying by time is applied to the fluid particles. But I want to apply initial velocity, acceleration and pressure which vary with the position of particles (both in X and Z coordinates), for example as a cosine function.

    regards



    Did you find a solution for this ?

  • AlexAlex

    You can use INITIALS option to assign a initial velocity to a give fluid domain (Check XML_GUIDE.pdf)

    You can also use INLET to assign initial pressure distribution

  • zweihuehnerzweihuehner
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    Alex

    You can use INITIALS option to assign a initial velocity to a give fluid domain (Check XML_GUIDE.pdf)

    You can also use INLET to assign initial pressure distribution

    Thanks Alex,


    I checked your suggestions and I found <velwave> to be an interesting options for my problem. Its usage is explained in CaseTemplate.xml.

    However, I would be interested in the underlying theory the solitary wave uses. Where can I find any information about this? It is only very shortly mention in the XML_GUIDE.pdf


    Also, in CaseTemplate.xml I found <velmesh>, which seems to allow to import a .csv file. This option is not mention in the XML_GUIDE.pdf. Do you know if it allows to set the initial velocity for each fluid particle by a csv file? Unfortunately, there is no description, how the .csv fiel has to look.


    Kind regards,

    Faro

  • Asalih3dAsalih3d
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    zweihuehner

    https://forums.dual.sphysics.org/discussion/comment/5454#Comment_5454

    Thanks Alex,

    I checked your suggestions and I found <velwave> to be an interesting options for my problem. Its usage is explained in CaseTemplate.xml.

    However, I would be interested in the underlying theory the solitary wave uses. Where can I find any information about this? It is only very shortly mention in the XML_GUIDE.pdf

    Also, in CaseTemplate.xml I found <velmesh>, which seems to allow to import a .csv file. This option is not mention in the XML_GUIDE.pdf. Do you know if it allows to set the initial velocity for each fluid particle by a csv file? Unfortunately, there is no description, how the .csv fiel has to look.

    Kind regards,

    Faro

    In these cases it is the best to just try and poke around with a very simple case and try the options. Hope it works out for you!

    Kind regards

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