View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0001008 | OpenFOAM | Bug | public | 2013-09-12 17:33 | 2014-02-18 09:20 |
| Reporter | Assigned To | ||||
| Priority | low | Severity | text | Reproducibility | N/A |
| Status | resolved | Resolution | no change required | ||
| Summary | 0001008: UserGuide gives wrong relation between absolute and sensible enthalpy | ||||
| Description | The UserGuide (p. 181, eq. 7.1) specifies h = h_s + \sum_i c_i \Delta h_f^i where c_i is said to be the molar fraction. This is clearly wrong, and c_i should be the mass fraction instead (commonly Y_i). See e.g. Kuo, "FUNDAMENTALS OF TURBULENT AND MULTIPHASE COMBUSTION", 2012, p. 19, table 1.4) | ||||
| Tags | No tags attached. | ||||
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OpenFOAM uses internally units [J/kmol] for enthalpy, hence the mole averaging. This could probably be mentioned in the user guide. In the source code, typically upper case letters (e.g. Ha) indicate [J/kg] and lower case (e.g. ha) [J/kmol]. see also: https://github.com/OpenFOAM/OpenFOAM-2.2.x/blob/master/src/thermophysicalModels/specie/thermo/thermo/thermo.H#L226 https://github.com/OpenFOAM/OpenFOAM-2.2.x/blob/master/src/thermophysicalModels/specie/thermo/janaf/janafThermo.H#L187 |
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Ah, yes, in that case it is correct. I agree, though, that this certainly should be mentioned in the user guide. |
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not a bug in OpenFOAM |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2013-09-12 17:33 |
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New Issue | |
| 2013-09-12 18:02 | dkxls | Note Added: 0002487 | |
| 2013-09-13 05:16 |
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Note Added: 0002489 | |
| 2013-09-13 05:16 |
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Note Edited: 0002489 | |
| 2014-02-18 09:20 |
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Note Added: 0002840 | |
| 2014-02-18 09:20 |
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Status | new => resolved |
| 2014-02-18 09:20 |
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Resolution | open => no change required |
| 2014-02-18 09:20 |
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Assigned To | => user2 |
