u/EnvironmentalZone825

So my grandparents have this chimney made to replace the broken one.

Since the builder decided to make it thinner on the top and because this is a windy area, when we have wind almost no smoke goes out the chimney.

My idea was to do something like in the drawing, like a wall with a steel sheet so that the wind does not hit the vents directly in hopes that that fixes it.

I am however looking for guidance as I don't know a whole lot about chimney physics.