Determination of soil attenuation by geophysical prospecting and the validity of measured Q values for numerical simulations

1994 ◽  
Vol 31 (2) ◽  
pp. A88
Keyword(s):  
Numerical Simulations ◽  
Geophysical Prospecting ◽  
Q Values

scholarly journals Determination of braking force on the aerodynamic brake by numerical simulations

2014 ◽  
Vol 42 (2) ◽  
pp. 106-111 ◽  
Author(s):  
Mirjana Puharic ◽  
Dusan Matic ◽  
Suzana Linic ◽  
Slavica Ristic ◽  
Vojkan Lucanin
Keyword(s):  
Numerical Simulations ◽  
Braking Force ◽  
Aerodynamic Brake

scholarly journals Determination of the influence of herbicides on dicotyledons plant transpiration using the sap flow method

2014 ◽  
Vol 60 (No. 12) ◽  
pp. 562-568 ◽  
Author(s):  
V. Brant ◽  
J. Pivec ◽  
K. Hamouzová ◽  
P. Zábranský ◽  
J. Satrapová ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Transpiration Rate ◽  
Sap Flow ◽  
Herbicide Application ◽  
Plant Transpiration ◽  
Flow Method ◽  
Infrared Gas Analyser ◽  
The Impact ◽  
Q Values

Physiological parameters are sensitive and provide information on the toxicity of herbicides in plants. The impact of herbicide application on plant transpiration was evaluated by the sap flow method during 2009&ndash;2011. The aim of this work was to verify the sap flow method for determining the effect of herbicides on the basis of continuous measurements of the transpiration flow. Helianthus annuus was used as a model plant species. The two different herbicides tested in this study differed by the effect of active ingredients bromoxynil and clopyralid. The water flow was measured using sap flow meter T4.2. The impact of herbicides was assessed by comparing measured transpiration rate (Q) after herbicide application with an extrapolation of transpiration rate of plants before herbicide treatment (Q<sub>calc</sub>). After treatment with bromoxynil the Q values decreased significantly compared to Q<sub>calc</sub>. For plants treated by clopyralid, the decline of actual transpiration (Q) compared with the modelled one (Q<sub>calc</sub>) was less substantial and the plants continued to transpire after the treatment. The effect of herbicides was also verified using infrared gas analyser and chlorophyll fluorescence meter.

Numerical Simulation of Offshore Pipeline Installation by Lateral Deflection Procedure

2007 ◽  
Author(s):  
Danilo Machado Lawinscky da Silva ◽  
Rodrigo Almeida Bahiense ◽  
Breno Pinheriro Jacob ◽  
Fernando Gomes da Silva Torres ◽  
Antonio Roberto Medeiros ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Computational Tool ◽  
Lateral Deflection ◽  
Correct Definition ◽  
Offshore Pipeline ◽  
Definition Of

Conventional offshore pipeline installation operations in Brazil have been performed in an S-Lay procedure employing the BGL-1 barge, owned by Petrobras. However, this procedure has some limits, and may not be feasible in some particular scenarios. Therefore, the objective of this work is to present the numerical simulation of an alternative pipeline installation procedure. This procedure basically consists of performing the pipeline assembly on shore, and deflecting it to the sea using a tug boat. The numerical simulations employ the SITUA-Prosim computational tool, which is able to incorporate the correct definition of the seabed and shore from bathymetric curves. An actual pipeline installation by this lateral deflection procedure is analyzed and discussed. The characterization of the procedure passes through the determination of the better velocity and direction of the tug boat in order to minimize the efforts on the pipeline (especially due to the curvatures).

Determination of the laminar-turbulent transition location in numerical simulations of subsonic and transonic flows past a flat plate

2019 ◽  
Vol 26 (5) ◽  
pp. 629-637 ◽  
Author(s):  
A. V. Boiko ◽  
K. V. Demyanko ◽  
A. A. Inozemtsev ◽  
S. V. Kirilovskiy ◽  
Yu. M. Nechepurenko ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Flat Plate ◽  
Transonic Flows ◽  
Turbulent Transition ◽  
Transition Location ◽  
Laminar Turbulent Transition
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