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Ansys Fluent Help Needed Urgently

  • 22-02-2014 11:57am
    #1
    Dugganst
    Registered Users, Registered Users 2 Posts: 4 ✭


    Hi,

    I am trying to model a piston extending in a cylinder in fluent, but i have know experience with this software and I am pulling my hair out trying to figure it out. If anyone can help please message me I am willing to pay to get this project solved.

    Thanks
    Stephen


Comments

  • #2
    Sarz91
    Closed Accounts Posts: 1,422 ✭✭✭Sarz91


    Dugganst wrote: »
    Hi,

    I am trying to model a piston extending in a cylinder in fluent, but i have know experience with this software and I am pulling my hair out trying to figure it out. If anyone can help please message me I am willing to pay to get this project solved.

    Thanks
    Stephen

    Model the piston in Solidworks or in whatever program you use for modelling and then import it into Fluent.


  • #3
    Dugganst
    Registered Users, Registered Users 2 Posts: 4 ✭Dugganst


    Sarz91 wrote: »
    Model the piston in Solidworks or in whatever program you use for modelling and then import it into Fluent.

    I have the geometry created in solids works as shown below:

    I am not sure how to detail the motion of the piston in the cylinder which would be filled with air. As when I import the geometry it does not give me a region to select as air only the geometry.


  • #4
    Sarz91
    Closed Accounts Posts: 1,422 ✭✭✭Sarz91


    Dugganst wrote: »
    I have the geometry created in solids works as shown below:

    I am not sure how to detail the motion of the piston in the cylinder which would be filled with air. As when I import the geometry it does not give me a region to select as air only the geometry.

    What is the purpose of the study? Is there a way that you could possibly simplify the problem? Could you make a 2d problem instead of a 3d problem? I'd like to help but you haven't given much to go on. Have you completed any tutorials for fluent?


  • #5
    Dugganst
    Registered Users, Registered Users 2 Posts: 4 ✭Dugganst


    I have attached a PDF detailling the project a bit more i have been working with 2D geometry but I cant get that to work so I tried 3D. I have read a good few tutorials that are as close to this project as I can get but they are not helping.


  • #6
    Dermighty
    Closed Accounts Posts: 2,748 ✭✭✭Dermighty


    You can very easily simulate the motion of the piston in Autodesk Inventor (or Solidworks).

    I can't say if you can model the movement of fluid (liquid or gas) within the cylinder in one of these software packages.


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  • #7
    Sarz91
    Closed Accounts Posts: 1,422 ✭✭✭Sarz91


    I'm at work at the moment so I haven't gotten a chance to read through the brief but would something like this work if you're just interested in the motion of the piston?


  • #8
    chris85
    Registered Users, Registered Users 2 Posts: 4,502 ✭✭✭chris85


    Sarz91 wrote: »
    I'm at work at the moment so I haven't gotten a chance to read through the brief but would something like this work if you're just interested in the motion of the piston?

    That would work quite well, good technique for modelling it I think.

    OP, dont try do this in 3d as problem can very much be simplified to a 2d problem. More importantly you will need to look at the meshing of the environment and boundary conditions placed. These are much more important. A badly defined problem will always be wrong. Meshing and boundary conditions will allow a well defined problem. Would look at modelling something like in the youtube video and focus on technicalities of meshing next. And meshing is not just about creating a mesh, its about creating the right mesh for the problem and the conditions you are going to apply to the model.


  • #9
    Dugganst
    Registered Users, Registered Users 2 Posts: 4 ✭Dugganst


    chris85 wrote: »
    That would work quite well, good technique for modelling it I think.

    OP, dont try do this in 3d as problem can very much be simplified to a 2d problem. More importantly you will need to look at the meshing of the environment and boundary conditions placed. These are much more important. A badly defined problem will always be wrong. Meshing and boundary conditions will allow a well defined problem. Would look at modelling something like in the youtube video and focus on technicalities of meshing next. And meshing is not just about creating a mesh, its about creating the right mesh for the problem and the conditions you are going to apply to the model.

    That video is what I am trying to do with this geometry attached. The top and bottom pictures will be the start and end of the combustion process respectively. But It is the dynamic meshing i am having the trouble with. I do not understand how to make the walls of the piston move to compress the gas.


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