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How to define setFields to have a triangle fluid domain in 2D case?

Hi, every one,

I am just new to OpenFoam and now my case is a inclined rectangular tank with a horizontal water surface(water depth is very low) as the initial condition. But when I go through Dambreaking tutorial, I find that I can only define a box-shape fluid domain rather than a triangle one, which doesnot work in this case. Could anyone please tell me that how to define such a fluid domain as in the pic?Attachment 37844 Any information is appreciated. Thanks!

Hi,

If your mesh is not inclined, you can use rotated box, so the intersection of the mesh and rotated box is triangle (case A on attached image, search the forum for syntax of rotatedBox in setFields), if your mesh is inclined, you can use just box (case B on attached image).

Quote:

Originally Posted by alexeym (Post 536455)

Thank you! Alexey Matveichev,

I used the first method u mentioned and it works quite well. Thanks for help!:)

Best regards

water domain above slopped surface

Hello
Could someone please help me define a volume of water above a sloped surface? Basically, I need to define a triangular volume of water in setField. Please see the figure attached.

Thanks

Hello behnazphp

I don't know if after a long time can you reply back to me. but I have a similar issue.
could you finally define directly the initial conditions by rotatedboxToCell in setFieldsDic?

Thanks

Quote:

Originally Posted by ahparvin (Post 819453)

Hello;

I have a similar issue. I want to define a trapezoidal shape initial condition for a dam break problem. This shape is formed from overlapping the Mesh and a rotated box with different alpha values.
I tried to do that by defining a rotatedboxTocell in the setFields dictionary.
However there is no error in running setField but after that in initial conditions, I can not see any sign of water alpha = 1.

Any of you can help me with that?

Attachment 87808

Code:

/*--------------------------------*- C++ -*----------------------------------*\

  =========                 |

  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox

   \\    /   O peration     | Website:  https://openfoam.org

    \\  /    A nd           | Version:  7

     \\/     M anipulation  |

\*---------------------------------------------------------------------------*/

FoamFile

{

    version     2.0;

    format      ascii;

    class       dictionary;

    location    "system";

    object      setFieldsDict;

}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //



defaultFieldValues

(

    volScalarFieldValue alpha.water 0

);



regions

(

    rotatedBoxToCell

    {

        name    rotatedBox1;

        type    cellSet;

        action  new;

        source  rotatedBoxToCell;

        origin  (0.3 0.2 10);

        i       (-0.1 -0.1 0);

        j       (0.1 -0.1 0);

        k       (0 0 -20);

        

            fieldValues

        (

            volScalarFieldValue alpha.water 1

        );         

    }  

       

);

hi xiaor1
can u please explain how u get the triangle box for water area i try use Rotatedbox utility but can not define the i , j ,k vectors