[neytirilover]

Hi Niels,

I've been trying to modify the tutorial case "waveFlume", and encounterred this problem:

I was trying to use a larger mesh size for the relaxation zones, i.e.: the entire length of the domain was 18m and the first and last 5m was relaxation zone, I was trying to use a mesh size of 1cm*0.5cm in the section of 5 to 13m, and use a mesh size of 2cm*0.5cm inside the relaxation zones. I did this using three mesh blocks in blockMeshDict (please see attached).

The problem is now waves2Foam seemed to recognize the end of the first block, or the beginning of the second block (at x=5m) as the outlet relaxation zone, and no wave can propagate into x=5 to 13m domain. Can you help me to determine where the problem is? I attached the blockMeshDict file for your reference.

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  1.5                                   |
|   \\  /    A nd           | Web:      http://www.OpenFOAM.org               |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

vertices        
(
    (  0 -0.4 0 )	//0
    ( 10 -0.4 0 )	//1
    (  0  0.2 0 )	//2
    ( 10  0.2 0 )	//3
                 
    (  0 -0.4 0.1 )	//4
    ( 10 -0.4 0.1 )	//5
    (  0  0.2 0.1 )	//6
    ( 10  0.2 0.1 )  	//7

    (  10 -0.4 0 )	//8
    ( 11 -0.4 0 )	//9
    (  10  0.2 0 )	//10
    ( 11  0.2 0 )	//11
                 
    (  10 -0.4 0.1 )	//12
    ( 11 -0.4 0.1 )	//13
    (  10  0.2 0.1 )	//14
    ( 11  0.2 0.1 ) 	//15

    (  11 -0.4 0 )	//16
    ( 18 -0.4 0 )	//17
    (  11  0.2 0 )	//18
    ( 18  0.2 0 )	//19
                 
    (  11 -0.4 0.1 )	//20
    ( 18 -0.4 0.1 )	//21
    (  11  0.2 0.1 )	//22
    ( 18  0.2 0.1 )     //23               
);

blocks          
(
    hex (0 1 3 2 4 5 7 6) ( 1000 120 1 ) simpleGrading (1 1 1)
    hex (8 9 11 10 12 13 15 14) ( 200 120 1 ) simpleGrading (1 1 1)
    hex (16 17 19 18 20 21 23 22) ( 700 120 1 ) simpleGrading (1 1 1)
);

edges           
(
);

patches         
(
    patch inlet
    (
        (0 4 6 2)
    )
    wall bottom 
    (
        (0 1 5 4)
	(8 9 13 12)
	(16 17 21 20)
    )
    patch outlet
    (
        (17 21 23 19)
    )

    patch atmosphere 
    (
        (2 3 7 6)
	(10 11 15 14)
	(18 19 23 22)
    )
    
    empty frontBack
    (
        (0 1 3 2)
	(8 9 11 10)
	(16 17 19 18)
        (4 5 7 6)
        (12 13 15 14)
        (20 21 23 22)
    )
);

mergePatchPairs
(
);

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

Best Regards,

Conghao

[ngj]

Hallo Conghao,

Your blockMeshDict does not match what you describe in terms of coordinates. Please use relaxationLayout to visualise your relaxation zones. That would enable you to debug the problem.

Kind regards,

Niels