不清楚商软那面怎么回事，本身我也没太关注这个，我查了一下，OpenFOAM本身这面的streamline看起来是你说的patiline：
This function object generates streamline data by sampling a set of user-specified fields along a particle track, transported by a user-specified velocity field.后处理软件paraview的streamline是如何定义的还没找到。