[alimea]

Hi guys

1- I want to know about "commands in openfoam:. e.g. I don't know what "Info" command do? or "mesh" ,...
Could you please introduce me a page which tells me the performance of every command?

2- I want to know about step by step of solvers. For example in the buoyantBoussinesqSimpleFoam, I couldn't get the trend of solving! where can I get my answer?

Thanks a lot

[Jerryfan]

Hi alimea,


First of all, I don't think those mentioned in your questions are called commands in OpenFOAM. They are actually variables from programming's perspective in my opinion. Semantically, they are no difference with normal c++ variable

int myfoamvar

. Back to your question, Info is a new output stream defined in OpenFOAM. Principally, it just like the c++ standard output cout. The reason why OpenFOAM defines this is that the stream operator << has to be overloaded so that it can handle the output of variables defined in OF. For example, the output of a vector, a list, a Field.... The same reason also applies to the stream operator >>.

As for mesh, of most of the solvers, mesh is a fvMesh variable, see the definition below:

fvMesh mesh
(
IOobject
(
fvMesh::defaultRegion,
runTime.timeName(),
runTime,
IOobject::MUST_READ
)
);

Semantically, it's no difference than

myfvMesh mesh(...)

if we have a myfvMesh class we defined ourselves in c++. fvMesh class defined in OF for handling discretization using finite volume method. For this general information, you can find in the class description of each class in the source file. If you really want to know everything in detail, I think you somehow need to dig into the source code. You can always get some scattered information for what you are looking for just by google. But I strongly suggest you to study the source code. It tells everything though not in a straightforward way. To be honest, I am also very new to OF. I just started March this year. But I found it's really interesting sometimes to dig out something out of the source code.
I don't know too much about the solver you mentioned in question 2 now. I think it's better to post another sperate post specifically for seeking explanations of this solver. I believe lots of Foamers know and use this solver.

[anishtain4]

if you want to understand what they mean and how they are related first of all read
OpenFOAM programmer's guide, or even user guide before that. You are going to need a good basic understanding of c++ or having a hard time figuring out things.
A good place to start is to take a look at $FOAM_APP/test and go through them step by step while consulting Doxygen documentations.

[Jerryfan]

Hi Alimea,


Agree with anishtain4. The examples in the test folder are very good sources for learning OF. If you want, you can even debug with examples. This way you will know the details step by step.

[alimea]

Thanks my friends
I have done some examples in O.F., but they didn't have any changing in code such as in solvers! so I don't have any experience about that. [/LEFT][/RIGHT]

[Jerryfan]

Hi alimea,


I started with the solvers in the basic directory. Those are the most fundamental solvers in O.F. Usually, it's much easier to start off. Try to modify starting from this point.