I just built a $70,000 digital PC and visualized its terrible airflow in 3D with this neat part-picking website
Ah airflow. If you get it just right, it's like a breath of fresh air. If you get it wrong, it's like a breath of old dusty air pointing right at your GPU. If you're planning out your next build and want a rough approximation of where your air will flow, BuildCores has a neat new feature.
As shared over on the PCMR subreddit, creator bosoxs202 demonstrates it with a handful of builds. It's worth noting it's not a full-on simulation; it can't demonstrate how a GPU might get in the way of a fan...