View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0001382 | OpenFOAM | Bug | public | 2014-08-25 21:00 | 2015-02-13 09:22 |
| Reporter | projectionist | Assigned To | henry | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Platform | Linux | OS | Ubuntu | OS Version | 14.04 |
| Summary | 0001382: IATE: possible sign error at the randomCoalescence IATESource model | ||||
| Description | In the IATE model, there are 3 contributions from bubble-bubble interaction. These are 'breakage due to turbulent impact (TI)','coalescence through random collision driven by turbulent eddies (RC)' and 'coalescence due to wake entrainment (WE)'. For the transport equation of interfacial area concentration the first effect (TI) acts as a source and the other two (RC and WE) act as a sink. Breakage decreases bubble size and thus increases the interfacial area, whereas, coalescence increases bubble size and decreases interfacial area. Consequently, the term modelling (TI) has to have a different sign as the terms for (RC and WE). | ||||
| Steps To Reproduce | The right hand side of the kappaEqn is -fvm::SuSp(R, kappai_) and R is defines as R -= sources_[j].R(); So both minus signs cancel out and we can look at the R() methods in the daughter classes of IATEsource. Here is a brief summary of what is implemented (Build: 2.3.x-2a185786c1f3) TI: R[celli] = (1.0/3.0)* /* other stuff*/ RC: R[celli] = 12*phi()* /* other stuff*/ WE: R() { return (-12)*phi()* /* other stuff */ This shows, that TI and RC act as a source and only WE as sink. For the implementation to obey Ishii et al. RC has to act as a sink, thus it should say RC: R[celli] = (-12.0)*phi()* /* other stuff*/ Please have a look on the source models for the IATE model to check if my findings are correct. | ||||
| Tags | No tags attached. | ||||
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2014-08-25 21:00 | projectionist | New Issue | |
| 2015-02-13 09:22 | henry | Note Added: 0003754 | |
| 2015-02-13 09:22 | henry | Status | new => resolved |
| 2015-02-13 09:22 | henry | Resolution | open => fixed |
| 2015-02-13 09:22 | henry | Assigned To | => henry |
