Re: [ESPResSo-users] Simulating partially immersed deformable objects

[Ivan Cimrak]

Dear Edvin,


My apologies for so delayed  answer.


Object-in-fluid extension works almost independently of the fluid part, 
the only interaction is via the fluid-particle coupling. From what I 
know about Shan-Chen in Espresso, there is an analogical coupling. So in 
principle I think the OIF should perfectly work with Shan-Chen (although 
I have not tested it yet).


In any case, this is an interesting scenario and if you decide to try 
it, I will be glad to help you when you get into troubles with the OIF 
part, just let me know.


With best regards,

Ivan




On 9/5/16 1:22 AM, Edvin Memet wrote:
> Dear all,
>
> I'm interested in simulating a system like the following: an array of 
> nanopillars partially immersed in a fluid. Capillary, bending, and 
> interpillar interaction forces are all of interest.
>
> I've been trying to understand methods of coupling LB to deformable 
> object in general, as well as the current capabilities of Espresso in 
> particular.
>
> From my limited understanding, the objects-in-fluid (OIF) extension 
> seems like the closest starting point for what I want. However, I want 
> the pillars to be partially immersed in the fluid, which I'm not sure 
> is possible. Would it be possible to get that effect by using a two 
> component Shan-Chen fluid (e.g. water and air)? If so, can you even 
> use OIF with Shan Chen? And from my documentation, it seems Shan Chen 
> only runs on GPU - is that still the case?
>
> Or rather than using Shan-Chen, perhaps an easier way of simulating 
> partial immersion is to set the friction coefficient to zero for part 
> of the mesh (it seems it isn't currently possible to  individually set 
> the friction coefficient for each mesh node, but perhaps it shouldn't 
> be too difficult for me to figure out a way to do so). Hope that makes 
> sense.
>
> Any guidance/thoughts appreciated.
>
> Best,
> Edvin