160 reputation
7
bio website youtube.com/zonerarefatte
location San Diego, CA
age 25
visits member for 2 years, 6 months
seen 2 days ago

Knowledge and understanding are quite different. Only understanding can lead to being, whereas knowledge is but a passing presence in it. (G.Gurdjieff)


Dec
16
awarded  Caucus
Dec
13
comment Finite differences and conservation law
I edited the question to avoid getting too much into the detail of my specific problem, I hope that increases the interest.
Dec
13
comment Finite differences and conservation law
I edited the question to avoid getting too much into the detail of my specific problem, I hope that rises the interest.
Dec
13
revised Finite differences and conservation law
deleted 464 characters in body
Dec
13
comment Finite differences and conservation law
It seems to me that here the stiff term will have trouble, because there is no implicit part in your scheme.
Dec
12
comment Finite differences and conservation law
I tried to impose conservation on the whole r.h.s, by discretising it in conserved form, i.e. as a first derivative, but that gives me an unstable thing (I see sawtooth modes entering the grid)
Dec
12
revised Finite differences and conservation law
added 440 characters in body
Dec
12
asked Finite differences and conservation law
Jul
8
comment Space-dependent diffusivity and finite-differences
Found the mistake, in the explicit part I used $u_{j+1}-u_j$ instead of $[u_{j+1}-u_{j-1}]/2$!
Jul
8
comment Space-dependent diffusivity and finite-differences
Usually, to test it in the simplest case, I use $D(x)=x$ or $D(x)=1-x$, to see how it behaves going to both boundaries.
Jul
8
asked Space-dependent diffusivity and finite-differences
Jun
5
accepted Multiplying a vector and a matrix's rows
Jun
5
comment Multiplying a vector and a matrix's rows
Could you please explicit that?
Jun
5
asked Multiplying a vector and a matrix's rows
Apr
29
accepted Third-order Linear Parabolic PDE
Apr
29
asked Third-order Linear Parabolic PDE
Nov
7
awarded  Supporter
Oct
25
comment Vectorial derivative
@Nick Could you help me trying to explicit the calculation in components of with the index notation? Because I cannot see it, sorry.
Oct
25
comment Vectorial derivative
Why should I do that, mate?
Oct
25
asked Vectorial derivative