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Showing results 1 to 25 of 39 Search took 0.00 seconds. Search: Posts Made By: Andrea_85

Forum: OpenFOAM Programming & Development February 20, 2013, 05:03

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 Hi interFoamers, Someone has advanced with... Hi interFoamers, Someone has advanced with the implementation of interFoamSSF? I finally have some time to spend on it but i'm still confused about filtering stuff. best andrea

Forum: OpenFOAM Programming & Development June 13, 2012, 06:13

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 just a small comment, at pag.9 they say that... just a small comment, at pag.9 they say that fcf_average is the average of capillary forces over all faces where they are non-zero. Does cmptAv account for that? best andrea

Forum: OpenFOAM Programming & Development June 12, 2012, 06:05

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 Hi anton, i think i do not understand well your... Hi anton, i think i do not understand well your first question. what do you mean with "start filtering"?. I would first define grad(pc)-(grad(pc) dot ns)ns at the cell centers, then i would...

Forum: OpenFOAM Programming & Development June 7, 2012, 07:55

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 i observed exactly the same behavior. I hope this... i observed exactly the same behavior. I hope this is due to lack of the filtering step. i'll start to think about the implementation as soon i'll have time. best andrea

Forum: OpenFOAM Programming & Development June 6, 2012, 06:43

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 Hi Anton, my simulation is still bad, it is... Hi Anton, my simulation is still bad, it is loosing mass. The maximum value of alpha1 drops down to 0.5 after few time steps. Any idea of why?. Do you see the same? best andrea

Forum: OpenFOAM Programming & Development June 4, 2012, 05:23

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 ok i solved it. (nCorrPiso is nCorr and in pEqn:h... ok i solved it. (nCorrPiso is nCorr and in pEqn:h i changed pEqn.solve to match your version). would be great to have the full version compiled with OF 2.1.0. best

Forum: OpenFOAM Programming & Development June 4, 2012, 05:08

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 I tried to add changes to use adjustable time... I tried to add changes to use adjustable time step but i got some errors about pimple control. I copied pimpleControl.H/C/I.H from openFoam 2.0.1 in interFoamSSF's folders. This is the error ...

Forum: OpenFOAM Programming & Development June 3, 2012, 12:18

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 @Anton good question. i've never used crank... @Anton good question. i've never used crank nicholson scheme for my simulations and so i really do not known. My first guess is that it is enough to modify fvScheme but i am not sure. @Jakob Did...

Forum: OpenFOAM Programming & Development May 31, 2012, 07:53

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 Hi Anton, can you upload the test case with... Hi Anton, can you upload the test case with boundary and initial conditions on the repository. just to be sure we are using the same. thanks andrea

Forum: OpenFOAM Programming & Development May 24, 2012, 05:35

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 Hi, my simulation is really bad. the drop... Hi, my simulation is really bad. the drop starts to move along the z-axis but then, after a while, it diffuses away and the maximum value of alpha goes to 0.6/0.5. How are your results? andrea

Forum: OpenFOAM Programming & Development May 23, 2012, 05:39

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 i do not understand what you mean, poiseuille... i do not understand what you mean, poiseuille flow is something expected even for laminar flow for ex. i said that i would choose fixedValue uniform(0 0 0) for the lateral area of the cylinder ...

Forum: OpenFOAM Programming & Development May 23, 2012, 04:49

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 What boundary conditions did you choose? They... What boundary conditions did you choose? They write fixed velocity and zeroGradient for pressure everywhere, but on the jagged cylinder the correct condition should be wall BC, or not? andrea

Forum: OpenFOAM Programming & Development May 22, 2012, 10:58

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 i used gmsh, http://www.geuz.org/gmsh/,it is a... i used gmsh, http://www.geuz.org/gmsh/,it is a really easy software if you need simple geometry. The case is too big to be uploaded here. If you give me your e-mail i can send you (constant and...

Forum: OpenFOAM Programming & Development May 22, 2012, 10:20

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 This is what i have obtained with snappyHexMesh.... This is what i have obtained with snappyHexMesh. The mesh seems the same as in the paper. Did you already think about how to implement filter of capillary forces and capillary fluxes (pag 8-9)? ...

Forum: OpenFOAM Programming & Development May 21, 2012, 10:56

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 i think you are right, just use snappy without... i think you are right, just use snappy without "snap" option. It should do the job. andrea

Forum: OpenFOAM Programming & Development May 14, 2012, 08:45

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 After some attempts I realized why I had... After some attempts I realized why I had different results. The issue seems to lie in the smoothing of the gradient, so i decided to comment it out for the moment. I think more tests in this...

Forum: OpenFOAM Programming & Development May 14, 2012, 03:14

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 Hi Anton, did you just double the domain... Hi Anton, did you just double the domain (200e-6x200e-6x200e-6 and 40x40x40 cells) to get those results? because i got again bad results from my tests. Did you change anything else? andrea

Forum: OpenFOAM Programming & Development May 11, 2012, 11:43

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 hi jens, thanks to join the discussion. this... hi jens, thanks to join the discussion. this might explain picture 2 in which is clearly visible that spurious currents are higher in the gas phase but shouldn't we get something similar, but...

Forum: OpenFOAM Programming & Development May 11, 2012, 08:49

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 Have a look at the pictures i attached. maybe it... Have a look at the pictures i attached. maybe it might be a boundary effect in case of liquid droplet (first two pictures). i would try to make a bigger surrounding domain to see if performs better....

Forum: OpenFOAM Programming & Development May 11, 2012, 08:08

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 The two version we are using are the same, the... The two version we are using are the same, the only changes are PIMPLE controls. The test case is the same, the only difference at this point is the time step, it takes 5min wiht 1e-6 (I just...

Forum: OpenFOAM Programming & Development May 11, 2012, 06:41

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 i lowered the tolerance in p, pFinal, pcFinal,... i lowered the tolerance in p, pFinal, pcFinal, Ufinal and alpha1 to match your fvSolution and i got really nice results, even in the gas-liquid case (why we get different results in this case is a...

Forum: OpenFOAM Programming & Development May 10, 2012, 10:39

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 I can't get the same results with implicit mules... I can't get the same results with implicit mules and i dont know why. Did you change something in fvSchemes or fvSolution?. Can you post again the static test case. my plots look really different...

Forum: OpenFOAM Programming & Development May 10, 2012, 08:24

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 you are right but apparently the results look... you are right but apparently the results look better. the magnitude of spurious current is 10^-9 in liquid-liquid case when mules::explicit is used whereas is 10^-4 if implicit formulation is used. I...

Forum: OpenFOAM Programming & Development May 10, 2012, 07:46

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 #Robert I added these lines in... #Robert I added these lines in interfaceProperties.C volScalarField limitedAlpha1_ ( min(max(alpha1_, scalar(0)), scalar(1)) );

Forum: OpenFOAM Programming & Development May 10, 2012, 06:16

Replies: 135 parasitic currents Views: 32,473 Posted By Andrea_85 i made some other tests. I changed relaxation of... i made some other tests. I changed relaxation of phi in pEqn.H with relaxation of U=H/A, i added gradAlpha smooth in interfaceProperties.C and then i tryied to switch between mulesImplicit and...

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