return fem.jump(phi, s) * (-fem.average(psi, s) * vel_n + 0.5 * fem.jump(psi, s) * wp.abs(vel_n)) # Symmetric-Interior-Penalty diffusion term (See Pietro Ern 2012 ...

active = wp.where(nor[0] < -0.9999 or nor[1] < -0.9999, 1.0, 0.0) ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Thomas J Catalano is a CFP and Registered ...