Search found 357 matches

by Juha
24 Nov 2011, 10:31
Forum: ElmerSolver
Topic: Frequency analysis - Helmholtz
Replies: 6
Views: 2400

Re: Frequency analysis - Helmholtz

Hi,

You can enter arrays using array syntax like this:

Code: Select all

arr(4) = Real 1 2 3 4
However, the frequency for Helmholtz solver is a scalar property and can't be
entered as an array.

Regards, Juha
by Juha
24 Nov 2011, 10:19
Forum: ElmerSolver
Topic: density of material problem NS
Replies: 2
Views: 1351

Re: density of material problem NS

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...
by Juha
23 Nov 2011, 15:28
Forum: ElmerSolver
Topic: ResultOutput in VTU too slow
Replies: 7
Views: 1659

Re: ResultOutput in VTU too slow

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
by Juha
17 Nov 2011, 12:18
Forum: Software development
Topic: format/ordering of Stokes matrix
Replies: 2
Views: 2902

Re: format/ordering of Stokes matrix

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...
by Juha
04 Nov 2011, 22:27
Forum: ElmerSolver
Topic: ResultOutput in VTU too slow
Replies: 7
Views: 1659

Re: ResultOutput in VTU too slow

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
by Juha
27 Oct 2011, 08:18
Forum: ElmerSolver
Topic: WhitneyAVSolver crash
Replies: 3
Views: 3493

Re: WhitneyAVSolver crash

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
by Juha
26 Oct 2011, 11:20
Forum: ElmerSolver
Topic: Couette flow with temperature-dependent viscosity
Replies: 2
Views: 1116

Re: Couette flow with temperature-dependent viscosity

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
by Juha
20 Oct 2011, 13:50
Forum: ElmerSolver
Topic: Author of DFTSolver.f90 and dft-water test
Replies: 3
Views: 1050

Re: Author of DFTSolver.f90 and dft-water test

Hi,
well i'm not the author of that peace of code, but i've just commited
a fix anyway.
Regrds, Juha
by Juha
19 Oct 2011, 13:50
Forum: General
Topic: Space dependent boundary conditions
Replies: 9
Views: 3308

Re: Space dependent boundary conditions

Hi,

maybe not the case, but anyway...

If this is verbatim copy of the sif file definition

Code: Select all

real MATC "30*tx (2)+1.5"
it's wrong in that there should be no space between the "tx" and "(2)".

Regards,Juha
by Juha
19 Oct 2011, 13:04
Forum: ElmerSolver
Topic: Stokes and 2nd order elements
Replies: 2
Views: 1032

Re: Stokes and 2nd order elements

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 when using 2n...