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 Oct 6 answered Is there a formulation for (self-)accelerating fluid flow through permeable medium? Oct 6 comment Is there a formulation for (self-)accelerating fluid flow through permeable medium? Ok, moderators say I am not allowed to add the formula to your answer. I'll add another answer. Oct 6 accepted Is there a formulation for (self-)accelerating fluid flow through permeable medium? Oct 6 suggested rejected edit on Is there a formulation for (self-)accelerating fluid flow through permeable medium? Oct 6 comment Is there a formulation for (self-)accelerating fluid flow through permeable medium? Excellent! Biot Consolidation is the thing for me (at least in at this point). I'll edit the equation to your answer for future reference if you don't mind. Oct 1 revised Is there a formulation for (self-)accelerating fluid flow through permeable medium? clarified the question, fixed typos Oct 1 asked Is there a formulation for (self-)accelerating fluid flow through permeable medium? Oct 1 comment Laws of fluid flow in porous medium Could you tell more about the link? Its not working and the address suggests that it is a paper? Jan 28 comment Euler angle rotation - active/passive In this case the rotation around $Z'$ is $R_zP$. Your mathematics is correct but your are rotating your axis and your point (blue box). Rotate only the point. Jan 26 comment Euler angle rotation - active/passive In other words, the second rotation $R_z R_y P$ is a rotation respect to $Z$, not $Z'$ Jan 26 comment Euler angle rotation - active/passive @YugT yes the outcome of the rotation will be different in the figures and then it matches the calculation. That is the essential thing here. Do not change the axis what you use for rotation. Now, the rotation between figures 2 and 3 is $R_z (-1, 4,0)$. You want $R_z (-0.707, 4, -0.707)$. (Alternatively you can drop the $R_y$ in the bullet 2 in the text). Jan 26 answered Euler angle rotation - active/passive Jul 2 awarded Curious Jun 17 answered Nontrivial critical exponents in exactly solvable models? Jun 11 accepted What is a long-tailed distribution for physicists? Feb 13 awarded Popular Question Nov 14 awarded Notable Question Oct 1 revised How do GPS devices work? added more detailed answer: t vs. dt Oct 1 comment How do GPS devices work? @leonbloy: ok, good point. I change the answer a bit to be more correct. Aug 1 awarded Yearling