| FMDenaro |
January 26, 2018 11:17 |
Quote:
Originally Posted by moshe
(Post 679528)
I agree with what you say. Though, I have found a paper that does an incremental PM method (with a staggered grid) and they( use one sided approximations for P^{n} in the intermediate velocity field.
For a collocated grid, the one-sided does not work (I tried it for the sake of curiosity), and it would make sense.
* Calculating three-dimensional flows around structures and over rough terrain, C.W. Hirt, J.L Cook, JCP, 1972
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I don’know this paper, maybe the correction step uses the one-sided gradient from the opposite direction? But owing to the staggering v^n+1 and v* are on the same nodes but pressure is not. Thus, the gradient is automatically centered. |
