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"Hello World!" in OpenFOAM

本文是OpenFOAM编程基础系列文章的第一篇，也是自己学习的笔记，将随着学习的深入逐渐更新。本文的内容是在开源项目Basic OpenFOAM Programming Tutorials的基础上改写而来。由于原项目只有源代码和英文注释，本系列文章计划将代码进行分解、添加更加详细的注释，即是分享，也是自己学习。
下面，开始学习吧！首先，我们从OpenFOAM环境下输出“Hello World”开始。注意，此处假设你已经正确安装OpenFOAM，并且对linux系统的使用有一定的了解。

在终端中输入以下命令创建一个空白的求解器文件：

foamNewApp helloWorld

其中，helloWorld为编译后的求解器的名称。打开生成的helloWorld.C文件，将代码修改成如下内容：

#include "fvCFD.H"
int main(int argc, char *argv[])
{
    // OpenFOAM screen output is very similar to rudimentary C++ with its std::cout, std::nl and std::endl
    // being replaced with Foam::Info, Foam::nl, and Foam::endl.
    Info << "Hello there, I'm an OpenFOAM program!" << nl
         << "You don't need a mesh or anything to run it, just a bare OpenFOAM case will do." << nl
        << tab << "This is me again, just creating a tabulated new line, move along." << nl << endl;
    Info<< "End\n" << endl;
    return 0;
}

此时，在helloWorld文件下打开终端，运行对文件进行编译：

wmake

编译完成后，在任意位置的终端内运行：

helloWorld

你应该能得到如下输出：

$ helloWorld
Hello there, I'm an OpenFOAM program!
You don't need a mesh or anything to run it, just a bare OpenFOAM case will do.
        This is me again, just creating a tabulated new line, move along.

End