View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0004263 | OpenFOAM | Bug | public | 2025-08-10 13:25 | 2025-08-10 15:27 |
| Reporter | Wesley | Assigned To | henry | ||
| Priority | normal | Severity | major | Reproducibility | always |
| Status | closed | Resolution | no change required | ||
| Platform | Ryzen 7 7735HS processor | OS | Kubuntu | OS Version | 24.04 |
| Product Version | 12 | ||||
| Summary | 0004263: incompressibleMultiphaseVoF does not allow use of power law fluid model | ||||
| Description | Description of the issue: incompressibleMultiphaseVoF solver does not use the powerLaw fluid model values in the momentumTransport.fluid files Basic simulation: -T pipe, with 2 fluids entering from the 2 sides of the T, exiting the remaining path -Both fluids are powerLaw fluids -Both fluids have the same density -Both fluids have the same volumetric flow rate -k values differ by a factor of 10 between the two fluids Expected results: -The more viscous fluid will take more of the cross-sectional area of the pipe after the fluids are in contact -Inlet p and p_rgh are expected to abe about 1.0E+08 with the powerLaw fluid properties (from simulation using incompressibleVoF for a two-phase simulation and twoPhaseTransport in the momentumTransport file) Simulation results: -Results are consistent with the rheology in physicalProperties.*, not the rheology in momentumTransport.* -Each fluid takes 50% of the cross-sectional area -Inlet p is about 4.9E+02 -Inlet p_rgh is about 2.0E+02 I have not been able to find a tutorial for multi-phase simulation for non-Newtonian fluids, and have been trying get the simulation running. I can get the simulation running in OpenFOAM 9 (before location of fluid properties to changed for non-Newtonian fluids), but have not been able to get it working for OF 10, 11, 12, or 13. My assumptions that need to be checked: - incompressibleMultiphaseVoF is supposed to allow for simulation with non-Newtonian fluids - the files are setup correctly Desired outcome: - incompressibleMultiphaseVoF allows non-Newtonian fluids - if incompressibleMultiphaseVoF does not allow non-Newtonian fluids, suggestion for other solver that does | ||||
| Steps To Reproduce | Run the attached simulation or create your own simulation with a power law fluid. The .stl file is included, and has already been put into the polyMesh directory. For comparison, I have also included the file with the incompressibleVoF simulation. This simulation solves as I would expect from the planned properties and boundary conditions. | ||||
| Additional Information | I am marking the severity as major because I can't run the types of simulations I would like, and suspect the issue carries over to all non-Newtonian rheologies. Including more tutorials for solvers that allow using non-Newtonian fluids would be helpful for some users. I have reproduced this issue on Debian 12 and on Kubuntu 24.04 on multiple computers. I have reproduced this issue on OpenFOAM 10, 11, 12, and 13. I have asked for help and guidance on cfd-online.com and have not received feedback on how to better set up the files or how to get the simulation working. | ||||
| Tags | No tags attached. | ||||
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2025-08-10 13:25 | Wesley | New Issue | |
| 2025-08-10 13:25 | Wesley | File Added: Bug_Submission_incompressibleMultiphaseVoF_Solver.tar.gz | |
| 2025-08-10 13:25 | Wesley | File Added: Transient2PhaseIncompressibleVoF.zip | |
| 2025-08-10 15:27 | henry | Assigned To | => henry |
| 2025-08-10 15:27 | henry | Status | new => closed |
| 2025-08-10 15:27 | henry | Resolution | open => no change required |
| 2025-08-10 15:27 | henry | Note Added: 0013645 |
