DNS vs LES

DNS (Direct Numerical Simulation) and LES (Large Eddy Simulation) are both techniques for predicting fluid flow, such as air over an airplane wing. DNS calculates every tiny detail of the flow, providing highly accurate results but requiring immense computing power, making it impractical for large or complex problems. LES simplifies this by focusing on larger, more energetic flow structures and modeling smaller scales, balancing accuracy and computational efficiency. Essentially, DNS is like capturing every leaf in a forest, while LES captures the overall forest shape, helping engineers analyze and design more effectively.