TITLE | The title of the current problem to be run with HFPLUME. At most 50 alphanumeric characters. Optional, no default. |
TRES | Temperature of the reservoir mixture (DegreesC). -50 <= TRES <= 150. Mandatory. |
PRES | Absolute pressure within the reservoir (atm). 0.7 <= PRES <= 20. Mandatory. |
PRES must be greater than AIRPRESS in the AMBIENT block. | |
HFRES | Mass percentage HF in reservoir (%) 0 <= HFRES <= 100. Mandatory |
HCRES | Mass percentage inert ideal gas in reservoir (%) 0 <= HCRES <= 100. Mandatory |
H2ORES | Mass percentage water in reservoir (%) 0 <= H2ORES <= 100. Mandatory |
Note: The sum of HFRES HCRES and H2ORES need not be exactly equal to 100%. If the sum is smaller the HFPLUME program will add dry air to the reservoir mixture to get a 100% mixture. Too large values will be changed by the program and messages will be generated accordingly. For numerical reasons the mass percentage dry air in the mixture should preferably be larger than about 1%. |
CPGAS | Specific heat at constant pressure of the inert ideal gas (J/(mole.k) 5 <= CPGAS <= 200. Mandatory. |
MMGAS | Molar mass of the inert ideal gas (kg/kmole). 5 <= MMGAS <= 200. Mandatory. |
DMDT | Steady mass discharge rate (kg/s). 0.01 <= DMDT <= 1000. mandatory. |
DEXIT | Effective orifice diameter of the discharge pipe (m). 0.001 <= DEXIT <= 5. Mandatory. |
ZEXIT | Height above ground level of discharge opening (m). 0.0 <= ZEXIT <= 50. Mandatory. |
ZEXIT should be greater than ZR in the DISP block because otherwise model assumptions used in some atmospheric correlations will be violated. | |
ANGLE | Inclination of release opening with respect to horizontal (Degrees). -180 <= ANGLE <= 180. Optional, default is 0 degrees (downwind horizontal release). |
Therefore for a vertically upward release ANGLE is 90 degrees | |
DURATION | Duration of pollutant release (s). -10^{6} <= DURATION <= 10^{ 6} . Optional, default is -1 (steady release). |
If DURATION <= 0, then a steady release is assumed (infinite duration). Please note that this is not always a realistic scenario as the total amount of released pollutant can become very large. HFPLUME does not use DURATION itself as it only simulates steady releases, but for a proper transition to HEGADAS-S or HEGADAS-T the value of DURATION is needed. |
Z0 | Reference height for atmospheric data in this block (m). 0.1 <= Z0 <= 50. Mandatory. |
U0 | Ambient wind velocity at height Z0 (m/s). 0.5 < U0 <= 20. Mandatory. |
Please note that U0 can be small but never equal to 0. | |
AIRTEMP | Ambient air temperature at height Z0 (Degrees C) -50 <= AIRTEMP <= 50. Mandatory. |
AIRPRESS | Ambient air pressure at release height ZEXIT (atm). 0.7 <= AIRPRESS <= 1.1. Optional, default is 1.0 atm. |
AIRPRESS must be less than PRES in the RESERVOIR block. | |
RHPERC | Relative air humidity at release height ZEXIT (%). 0.0 <= RHPERC <= 100. Mandatory. |
ZR | Land surface roughness (m). 10^{-5 } <= ZR <= 1. Mandatory. |
ZR must be less than ZEXIT of the PIPE block. | |
PQSTAB | Pasquill/Gifford stability class. PQSTAB = A, B, C, D, E or F (character). Mandatory. |
The MMESOPT block contains the 'switches' which indicate the use of the extra options developed by Earth Technology and sponsored by Martin Marietta Energy Systems. An indicator value of 1 means that the corresponding option is used, a value of 0 means that the option is inactive.
ILIFT | Indicator for use of plume lift-off description (-). ILIFT = 0 or 1. Optional, default is 0. |
No additional data needed. When ILIFT = 0, HFPLUME will stop program execution when lift-off is detected for a plume after touch-down. When ILIFT = 1, a plume is allowed to become air-borne again after touch-down. See Chapter 9 in the HGSYSTEM 3.0 Technical Reference Manual for details. |
DLST | Last required plume diameter (m). -1000 <= DLST <= 1000. Optional, default is -1.0 (criterion inactive) |
If set to a negative value, the termination criterion will not be used. | |
SLST | Last required displacement measured along plume axis (m). -1000 <= SLST <= 1000. Optional, default is -1.0 (criterion inactive) |
If set to a negative value, the termination criterion will not be used | |
ZLST | Last required plume centroid height (m). -1000 <= ZLST <= 1000. Optional, default is -1.0 (criterion inactive) |
If set to a negative value, the termination criterion will not be used. | |
XLST | Last required horizontal displacement (m). -1000 <= XLST <= 1000. Optional, default is -1.0 (criterion inactive) |
If set to a negative value, the termination criterion will not be used. | |
ULST | Last required plume velocity (m/s). -1000 <= ULST <= 500. Optional, default is -1.0 (criterion inactive) |
If set to a negative value, the termination criterion will not be used. | |
HFLST | Last required HF concentration (mole %). -1000 <= HFLST <= 100. Optional, default is -1.0 (criterion inactive) |
If set to a negative value, the termination criterion will not be used. | |
HCLST | Last required inert gas concentration (mole %). -1000 <= HCLST <= 100. Optional, default is -1.0 (criterion inactive) |
If set to a negative value, the termination criterion will not be used. |
RULST | Excess velocity ratio (-). 10^{-3} <= RULST <= 1.0. Optional, default is 0.1. |
RELST | Entrainment ratio (-). 10^{-3} <= RELST <= 1.0. Optional, default is 0.3. |
RGLST | Buoyancy effect for advection (-). 10^{-3} <= RGLST <= 1.0. Optional, default is 0.3. |
RNLST | Buoyancy effect for passive diffusion (-). 10^{-3} <= RNLST <= 1.0. Optional, default is 0.1. |
RALST | Aspect ratio for passive diffusion (-). 10^{-3} <= RALST <= 1.0. Optional, default is 0.2. |