[ashishmagar600]

Hello all.

I am trying to simulate an IC engine with valve movements.

I got started by looking at kivaTest tutorial, however, it does not has any info about what/how to specify valve and their movement.

I found some tutorials on the forum, but they were for a much older version of OF.

1. What things are actually needed for valve attachment/detachment simulations?
2. what are maxBottomLayer, minBottomLayer same for topLayer?

I guess this is much needed because there is not a single thread about the implementation of valve movements (at least on the forum, I have spent days searching for help here).
If there is such please help with a link.


Thanks

[ashishmagar600]

Okay. So I could make helping me easier.

I edited the engineGeometry file as:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  5                                     |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      engineGeometry;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

engineMesh      layered;

conRodLength    conRodLength [0 1 0 0 0 0 0] 0.1443;

bore            bore [0 1 0 0 0 0 0] 0.084;

stroke          stroke [0 1 0 0 0 0 0] 0.008423;

clearance       clearance [0 1 0 0 0 0 0] 0.00115;

rpm             rpm [0 0 -1 0 0 0 0] 1500;



valves
(

    intakeValve
    {
        // Valve coordinate system
        coordinateSystem
        {
            type            cartesian;
            origin          (0 0 0);
            axis            (0 -0.242535625036333 0.970142500145332);
            direction       (0 -0.242535625036333 0.970142500145332);
        }

        // Patch  and zone names
        bottomPatch             invalve1-ch;
        poppetPatch             invalve1-ob; //combi
        stemPatch               stem1;

        curtainInPortPatch      C_in_port;
        curtainInCylinderPatch  C_in_cyl;

        detachInPortPatch	D_in_port;
        detachInCylinderPatch   D_in_cyl;

 
        // Vertex on edge of the step.  For the converter
        stemEdge           (-0.00975122959887842 -0.00484416245428456 0.00859814038560595);

        // Valve diameter
        diameter            0.028;

        // Minimum valve lift
        minLift             0.0001;

        // Layer thickness
/*        minTopLayer         0.0001;
        maxTopLayer         0.009;


        minBottomLayer      0.0005;
        maxBottomLayer      0.001;
*/
        // Lift Profile
        liftProfilefile "in_prof";

    }
);

However, any changes I make in here for valves, the solver skips them entirely. Even if I do a typo (like misspelling liftProfilefile as lftprof), it simply ignores them and starts Ux Uy iterations.

I don't know if I am missing something.

Thanks.

[wyldckat]

Quick answer: I received the PM you sent me, although I'm not very familiar with how to add/remove layers. But as far as I know:

1. Adding/removing layers might only be supported with foam-extend, but I've never used it myself, so I don't know exactly how it's done.
2. There is a training presentation by Gianluca Montenegro which should have information on how to use it. On this page: http://openfoam-extend.sourceforge.n...s/courses.html - look for "Advanced dynamic mesh motion".

[NablaDyn]

Hi everyone,
this thread is a bit old but in fact in names pretty much my current problem, so I decided to hijack it....


I created my own bash environment in which I can pretty effectively simulate moving-engine flows using engineFoam etc (important: OpenCFD's version, www.openfoam.com, i.e. OpenFOAM v2006 through 2206). However, until now, I am limitted to engines with vertical valves while using the fvMotionSolver mesh mover in engineGeometry because this one seems to only support unidirectional deformation, that is bound either completely to x, y or z axis, so canted valves don't seem to be possible to simulate. Or am I wrong?!...



My problem is that I definitely want to stick to the most recent cfMesh (as integrated into OpenCFD's OF version) because it is by far the most suitable for my cases. Hence, switching to The OpenFOAM Foundation's version (openfoam.org) which recently adopted a more general engine simulation approach (based on reactingFoam) that actually does allow to simulate canted valves quite easily, is no option either.


So here's my question: Does anyone of you have a good idea on how to circumvent the problem of unidirectional deformation in OpenCFD's engine solvers? I figured

a) adaptation the fvMotionSolver in a way that it allows for multidirectional deformation or

b) incorporation of the dynamicMeshDict. I thought this was possible naturally, but when I try, the engineFoam solver does not seem to care, meaning, dynamicMeshDict has absolutely no effect...
Unfortunately, my OpenFOAM programming skills are pretty limited. I tried approach a), but no success so far. Any help is appreciated...


so thanks in advance