[Ary]

Dear all,

This may be another stupid question, but I am so confued. So sorry to bother you.

When we construct mesh object for manipulation such as

Info<< mesh.cellVolumes() << endl;

We construct the mesh object by

Foam::polyMesh mesh
{
    IOobject
    (
        defaultRegion,
        runTime.timeName(),
        runTime,
        IOobject::MUST_READ
    )
};

So, why construct mesh based on path [runTime.timeName()] instead of maybe path [runTime.constant().polyMesh()] (or something representing case/constant/polyMesh/)?

I am confused that the mesh is supposed to relate to [constant/polyMesh/] directly rather than [time] directory, right?

If not, how does the [mesh] object get information (such as points, faces) from [constant/polyMesh] directory?

Thank you very much if any kind foamer could help me.

Best regards,
Ary

[dlahaye]

Does https://github.com/UnnamedMoose/Basi.../OFtutorial3.C help you?

[olesen]

Originally Posted by Ary

Dear all,

This may be another stupid question, but I am so confued. So sorry to bother you.

When we construct mesh object for manipulation such as

Info<< mesh.cellVolumes() << endl;

We construct the mesh object by

Foam::polyMesh mesh
{
    IOobject
    (
        defaultRegion,
        runTime.timeName(),
        runTime,
        IOobject::MUST_READ
    )
};

So, why construct mesh based on path [runTime.timeName()] instead of maybe path [runTime.constant().polyMesh()] (or something representing case/constant/polyMesh/)?

I am confused that the mesh is supposed to relate to [constant/polyMesh/] directly rather than [time] directory, right?

If not, how does the [mesh] object get information (such as points, faces) from [constant/polyMesh] directory?

Thank you very much if any kind foamer could help me.

Best regards,
Ary

The simple counter question: how would you manage restarts from dynamic meshes is you always construct from time = constant?

[Tobermory]

Originally Posted by dlahaye

https://github.com/UnnamedMoose/Basi.../OFtutorial3.C

That's what I love about this forum - whilst there's a fair amount of sand to sift, I am always tripping across nuggets like this one. Thanks Domenico!

[Ary]

Originally Posted by dlahaye

Does https://github.com/UnnamedMoose/Basi.../OFtutorial3.C help you?

Thank you so much for your kind reply.

I am so sorry. I didn't get it. I read the member functions before. But how the member functions work even [mesh] object didn't construct from [polyMesh] directory which really contains the poins, faces and cells?

I am sorry my question was not clear before.

[Ary]

Originally Posted by olesen

The simple counter question: how would you manage restarts from dynamic meshes is you always construct from time = constant?

Thank you so much for your kind reply.

Thank you for your question. I don't know anything about dynamic mesh yet. Maybe construct from two both, time and constant/polyMesh ?

I just wonder why the constructor doesn't include [polyMesh] parameter.

I am sorry I am a new foamer and if I make my question stupid.

[olesen]

If you read that constructing from timeName() also includes searching back in time until it reaches some valid mesh date, you'll recognize that timeName() also includes constant().
In addition to a static mesh (where everything is defined as "constant" and doesn't change) it is possible to have meshes with changing topologies and meshes in which only the points move, but the connectivity stays the same. These last ones are covered by the difference in points and face instances (if you are examining the code).

[Ary]

Originally Posted by olesen

If you read that constructing from timeName() also includes searching back in time until it reaches some valid mesh date, you'll recognize that timeName() also includes constant().
In addition to a static mesh (where everything is defined as "constant" and doesn't change) it is possible to have meshes with changing topologies and meshes in which only the points move, but the connectivity stays the same. These last ones are covered by the difference in points and face instances (if you are examining the code).

Thank you so much for your kind help. I will check that part to understand the question.

[olesen]

Originally Posted by Ary

Thank you so much for your kind help. I will check that part to understand the question.

Don't dive too deeply though - it's easy to get lost.

[Ary]

Originally Posted by olesen

Don't dive too deeply though - it's easy to get lost.

Thank you for the advice.