I need to explain why you feel the wind using deviations in ideal behavior by real gases. I have an idea, but I'm not sure if it's correct. I think that we feel the wind because real gas molecules do not necessarily have a negligible volume and so when there is a large group of gas molecules, you would feel it if it blew past you. As for why the gas molecules would move in one large group like that, I know wind is caused by differences in pressure, so do those differences in pressure have to do with the van der waals equation at all?