[LaurentDelaon]

Hi
when you do this :

Code:

IndicatorCircle2D<T> circle(center1, 0.1);

Is it possible (so far in the code ) to modify circle to ajust radius after it’s definition ?
like :

Code:

circle(center1, 0.5)

Is it possible to realise a change like this ?
Regards.

[LaurentDelaon]

hi marc
We have realise lot of things with openlb but I have minor miss-understand:
In cylinder2d how can I put 100400Pa inlet and 100200Pa outlet ?
I understand how doing inletPa pressure with material_3 outletPa pressure with material_4.

But seem I have pb to setting pressure… Should I do modify N? Re ? or other thing ?

Another question : is the pressure equivalent of the totale pressure ?

regards.

[LaurentDelaon]

hi I have a problem with the link it’s seem not the right place

[LaurentDelaon]

I think its an efficiency issue…
Maybe I made mistake ?

[LaurentDelaon]

Hi Albert,

In example cylinder2D the material cylinder is 5 (and 0)
The color I speak is the result of simulation and the blue color of the cylinder is the same blue color of the zero value velocity. So the material 1…
So you saiy to me it’s normal because the material 5 of cylinder don’t move… result that material 1 simulation velocity is null and have the blue color…

Can I affect boundary inflow pressure instead of velocity in cylinder2d ? How I change the pressure value ? think’s is it the rhoF valu 1 ? what is the correpondance with physical units ? Pa or bar ?
Seem not totaly clear to me…

Regard’s.

[LaurentDelaon]

Hi Mathias,

I have a question base on cylinder2d :

How can I change the color of cylinder (which is blue actually) ? put it in white by example…

regards.

Laurent.

[LaurentDelaon]

Alright i can put any material number that I wants ? Desicribed an area_i with the number_i.

[LaurentDelaon]

hi thank’s for your reply.
I have a doubt doc p43:

Quote:

(1=fluid,
2=no-slip boundary, 3=velocity boundary, 4=constant pressure boundary,
5=curved boundary, 0=do nothing)

.
Seem for me that material is typed :type 1 is fluid 3 velocity and 4 pression… define for each cuboid.
so boundary with 3 is velocity … if i want a pressure i do put a 4 no????
laurent.

[LaurentDelaon]

Hi robin
If you have two pressure boundary

Code:

bc.addPressureBoundary(superGeometry, 4, omegaP1);
bc.addPressureBoundary(superGeometry, 4, omegaP2);

how did you set the pressure inlet ? the code with inlet velocity and outlet pressure seem affecte the value pressure and velocity boundary base on the material of the cuboid wich define the output and the input…
Here you have two differents boudary with the same material 4. How did you do to affecte the correct value to each boundary ?
I try to modify cylinder2d to have delta P .

Laurent.

[LaurentDelaon]

Hi Mathias,
I have read the documentation,cylinder2d 3d, venturi and poiseuil.I read it again. Thank’s for your invitation!
Unfortunatly I can’t access to your site from my work…
I can’t come to Karlsruhe for the moment, but I can try to commmunicate via modern tool like internet email or forum…

Laurent

[LaurentDelaon]

Hi Mathias ,

I have read this article.
Not a deep help for me : I need information on how work the openLB on general principles.
I can’t read and analysis all the OpenLB code…
I can’t answer to my own questions for the moment so you should do wait a little time before I answer to other’s questions , no ?
help me to realise my project and you can use it to include it on your forum.

[LaurentDelaon]

Hi mathias
yes they are specifics simples questions on OpenLB…
on a very simple example it’s seem difficult to obtain clearly reponses.

And so, I contact you on the forum OpenLB, isn’t it?
what is the usage of your forum ???
I ‘am try to comes to your spring school but I need to obtain responses currently now.

Laurent.

[LaurentDelaon]

Hi Nicolas

I have two way for moving object during simulation. (1)moving cleaning and 2)porosity)
I try first way to
a) rename geometry to fluid (clearing of last material position object)
b) move it to next position (with the good material)
should I do other thing than just adjust on geometry or do I modify the slattice ?
what is the connection with collision and stream calculus? with sLattice ? is it transparent ?
I’m work with cylinder2d.
thank’s.
Laurent.

[LaurentDelaon]

thank’s you very much for your explainations : thats really help me!
I have also progress with the use of cylinder2d example I have replace with sucess the cylinder by a rectangle.
You complemantary explains should permit to understand better that I try to do:
a moving rectanle in a air flow like a simple valve (I have a real demonstrator with pression measures)

thank’s again Nicolas.

[LaurentDelaon]

hi mathias,

is cylinder 2d use air ? how represent air ?
can I put pression for inflow and outflow? like a delta P ?

laurent

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