Elmer Discussion Forum

Hi,

You can enter arrays using array syntax like this: However, the frequency for Helmholtz solver is a scalar property and can't be
entered as an array.

Regards, Juha

hi, I don't think you are doing anything wrong - and neither is the ElmerSolver. This is a known feature of flows, see any reference on computational fluid dynamics. If you increase your density keeping other factors constant,you in effect increase the Reynolds number of the flow. At some point your...

Hi,
Thanks for testing Linux vs Windows! I think the windows problem can be solved
by updating the compilers. I'll do that for our build machines, hopefully this week.
Regards, Juha

Hi Jonas, the P2/P1 element implementation using the nodal elements constraints the edge node pressures such that the pressure is linear over the element. The constraint is added to the local system, and no effort to eliminate (condensate) the corresponding degrees of freedom is made. This, among ot...

Hi,

i think there has been some slow I/O 'features' in gfortran/gcc on windows platforms from time to time.
Any chance someone testing some case both on windows & linux (with comparable hardware) and
reporting back?

RGDS, Juha

Hi,
the edge basis functions for second order elements have not been implemented
within ElmerSolver, sorry.There is even (a relatively new) error check implemented
in SVN head to capture this case.
Regards, Juha

Hi Petra,

using Maple to solve

d(exp(10/(1+x/2)*dv/dx)/dx=0

i get

v:=a+b*((2+x)*exp(-20/(2+x))-20*Ei(1,20/(2+x)))

with v(0)=1,v(1)=0 we have

a ~ 1.017288049, b ~ -2256.783772

evaluating this with x=[0,1] seems to agree with ElmerSolver results. Am i missing something?

-Juha

Hi,
well i'm not the author of that peace of code, but i've just commited
a fix anyway.
Regrds, Juha

Hi,

maybe not the case, but anyway...

If this is verbatim copy of the sif file definition it's wrong in that there should be no space between the "tx" and "(2)".

Regards,Juha

Hi, i think the "FluxSolver" can compute nodal fitted first derivatives for you, from which you could directly compute the second derivatives, whether using 1st or nth order elements. Don't really know any better way anyway... Don't have an immediate answer for the bubbles misbehaviour whe...