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-   -   Ducted - forces (http://www.cfd-online.com/Forums/openfoam/65867-ducted-forces.html)

Poltak Stanggang June 29, 2009 08:39

Ducted - forces
 
Hi all,

I try to run OpenFoam in case of Duct, with icoFoam and turboFoam.

1 - The first case : Duct moves by the velocity of 1 m/s, in side the water by velocity of zero.
2 - the second case: The water moves by velocity of 1 m/s, and Duct velocity eq. zero.
3 - The forces (controlDict).

I hope somebody can help me to lose this problems:

- why the calculations results are different by the case 1 and 2 ?
- how to define the reference density of fluid on the - controlDict?
- why I have error message as - "glibc detected*** corrupted double-linked-list", even the calculation produce -"forces"?

Greetings,

PoltakLS

henrik July 6, 2009 05:59

Dear Poltak,

- why the calculations results are different by the case 1 and 2 ?

Because you have not taken into account that the mesh should be moving in case 1, too.

Of course one would avoid moving the mesh by moving the frame of reference instead. However, to take this into account requires changes to the solver.

- how to define the reference density of fluid on the - controlDict?

Code:

    wallForces
    {
        type        forces;
        patches    (wall);
        rhoInf      1000;
        CofR        (0 0 0);
    }

- why I have error message as - "glibc detected*** corrupted double-linked-list", even the calculation produce -"forces"?

Probably because there is an incompatibility between your system and the binary release. Recompiling the library and applications should fix this.

Henrik

Poltak Stanggang July 6, 2009 07:42

Ducted - propeller
 
Hi, Herik

many thanks for your reply and suggestion.

As you see from FO tutorials/icoFoam/cavity, instead of wall movingWall, I used Ducted-propeller. All four BC: Left-, Right-, Upper- and down i used as symmetryPlane in one case and in the second cases as fixedWall.

Let me know your suggestion again, and thanks

PoltakLS


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