Sharing common data in C for scientific computing

In assignments where I have been forced to use C for scientific computing (rather than say, C++, my default choice), I often come across the following pattern:

There's usually a set of data that is commonly needed by many functions. For example, in solving PDEs, I would need to know the grid points, length of each dimension, etc. This leads me to often combining them in a struct, e.g.

struct parameters{
    unsigned int num_x;
    double length_x;
    // so forth
};

I then end up repeating myself in nearly every function: void f(struct parameters* p, ...). This wouldn't be so bad if it made sense for every function to have it as part of its interface, but it is not always the case, and I dislike the repetition anyway.

Are there any workarounds or useful design patterns to deal with this? Making a global p would fix this, but justifying the use of a global when they are generally not recommended is difficult.