Hi everyone I am trying to si
I am trying to simulate the free surface of a viscoelastic fluid I intend to use oldroyd-B model and VOF for free surface calculation. I appreciate any help
Hi I am also interested in
I am also interested in this topic and I am willing to work on this.
Hello, any progress in this
any progress in this subject? I've done some simulations using Oldroyd-B models, FENE-type models, etc. with a self-developed code. I just want to warn you: simulation of viscoelastic fluids is NOT straight forward and additional numerical problems arise, i.e. you have to stabilize the simulation otherwise you will get a blow up (high-weissenberg number problem).
So if you have any clue, how to include in OpenFOAM, I could assist with some expertise in (complicated) stabilizing simulations (actually, there are a lot of techniques, we have used simply a dissipation term to smooth the stress field).
hi stefan For my project I've
For my project I've done some experimental works with CMC solution this solution can adequately be modeled with power-law like equations although it shows viscoelastic effects, anyway I have added some of these models to openfoam and gained some coding experience(It was some coding practice not viscoelastic simulation;)). But I am still very interested in that topic and if you like we can cooprate.
Hello OpenFOAM experts I ha
Hello OpenFOAM experts
I have been trying to implement the Maxwell and Oldroyd-B models to study the viscoelastic flow phenomenon. I have stability problems as told by Mr. Stefan Radl. I would like to know more about these problems. Any help would be appreciated.
thank you veru much
Dear Raghu, I can send you
I can send you my work if you like, or you can look into my aiche paper [Radl, Tryggvason, Khinast. Flow and mass transfer of fully resolved bubbles in non-Newtonian fluids. AIChE 53 (2007), 1861-1878].
Usually, these fluids behave like beasts - I'd start with a simple (unsteady) shear flow to show the solver is working.
Dear Stefan, i would be int
i would be interessted in your work as well :-)
Regarding these fluids as beasts is probably the appropriate description..
Hi, The stability problems
The stability problems come from the fact, that these "damn stresses" don't have a diffusion term in the PDE. Diffusion makes life so much easier ;-)
This paper gives an overview about higher order methods for FVM method and viscoelastic models...maybe of some help?
J. Non-Newtonian Fluid Mech. 93 (2000) 287–314
Effect of a high-resolution differencing scheme on
finite-volume predictions of viscoelastic flows
M.A. Alves , F.T. Pinho, P.J. Oliveira
Hi, The source stability pr
The source stability problem is extended inf-sup (LBB) conditions. Introducing extra stress terms to governing equations includes extra compatibility conditions. Accuracy of velocity gradients has significant impact on stability/accuracy of schemes. We addressed these issues in our article "Computation of incompressible and weakly-compressible viscoelastic liquids flow: finite element/volume schemes
Journal of Non-Newtonian Fluid Mechanics
Volume 126, Issues 2-3, 10 March 2005, Pages 123-143 ".
Hi dear sradl, i am working on the viscoelastic fluid, and need to write the code by myself, however, i have not got any clue by now, i wonder could you please send me your work on this kind of complex fluid. thanks so much, i am really appreciate your kind help. Best Regards.Li
Hi, this thread might be useful:
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