Tag:simulation

№5|2019

SEWERAGE NETWORKS

bbk 000000

UDC 628.237

Fedorov Sviatoslav Viktorovich, Vasilyev V. M., Klementyev M. N.

Study of gas evolution in a sewer section

Summary

Transportation of wastewater through sewer networks is accompanied by the generation and evolution of gases from the flow. For a quantitative assessment of the gas evolution process a sewer section model has been developed in the ANSYS CFX finite element analysis package. The model takes into account the combined flow of wastewater, entrained air and sewage gas (e.g. carbon dioxide) coming from the collector tray. Monitoring was carried out in a section of the domestic sewage system (DN = 500 mm) in the industrial zone of Obukhovo in St. Petersburg. The measured values of the vacuum pressure are in the range of model calculations. The process of designing a computational area of the sewer section and establishing initial and boundary conditions is presented. As a result of modeling the dependences of the carbon dioxide concentration and the pressure of the gas-air environment in the underroof space of the pipeline with different slopes and filling levels were obtained. The results obtained can serve as a basis for the approach to predicting the process of gas evolution in sewer sections.

Key words

, , , , , , , ,

Скачать/download (PDF) free access

 

№9|2019

PIPELINE SYSTEMS

DOI 10/35776/MNP.2019.09.09
UDC 628.2+532.54

Dezhina I. S., Orlov V. А., Zotkin S. P.

The study of the surface texture of pipes with the purpose
of increasing their transporting capacity

Summary

The results of exploratory research on the transportation of water and sand in specially designed laboratory and work benches including a platform with replaceable modular polymer elements (troughs) with artificial roughness are presented. The methodology of experiments on large benches with modular piped elements using photo- and film equipment as well as devices for determining velocity, filling and slope is presented. The nature of the turbulence zones with a different texture of the inner surfaces of the troughs in the form of obstructions of different height is revealed. The results of hydraulic experiments are presented in two modes: single-phase (water without foreign inclusions) and two-phase (water mixed with sand of different fractional composition). According to the results of experimental studies the areas of effective operation of modular troughs for sand transportation for various textures of artificial roughness of pipes of sewer systems were identified. The expediency of using corrugated inner walls of pipelines transporting wastewater for the efficient removal of sand belts settled on the bottom and walls of the pipes is substantiated.

Key words

, , , ,

Скачать/download (PDF) free access

 

№9|2017

WATER INDUSTRY

bbk 000000

UDC 581.526.325

Babaev A. V., Zamana G. T., Puklakov V. V.

Model prediction of water quality patterns
in the Mozhaiskoe water reservoir under the heat wave conditions

Summary

The issues of water quality in water reservoirs used for public water supply are of primary concern. Intensive phytoplankton development in them is a most common problem in water supply. Therefore the selection of tools that provide for predicting to a high degree of accuracy the processes of water quality formation in water reservoirs under various hydro meteorological summer conditions is a task of primary importance. The results of the model prediction of the basic water quality patterns under the heat wave conditions and of the diagnostic calculation of the environmental conditions of the Mozhaiskoe water reservoir in 2014 carried out according to GMV-MGU model and verified by the field studies data are presented. The verification showed good reproduction of the water quality patterns of the Mozhaiskoe water reservoir by the model. The comparison of the model prediction results, diagnostic calculation and field studies data showed that the model prediction of the water reservoir conditions for the minimum winter storage decrease, low flow spring tide and excessive summer heat is coherent with the actual 2014 pattern when similar hydro meteorological conditions were observed. GMV-MGU model can be used for predictions and diagnostic calculations of water quality patterns in the water reservoirs used for public water supply in the process of planning the measures on operating and long-term control of hydroengineering facilities and water intakes operation.

Key words

, , , , ,

 

№7|2010

PROBLEMS, PERSPECTIVES

bbk 000000

UDC 628.22:532.542

Chupin V. R., Melekhov E. S., Chupin R. V.

Pressure Movement of Flows in Gravity Manifolds

Summary

A new approach to the design of water disposal systems based on their simulation with hydraulic chains with unrecorded withdrawals and inflows of runoffs is offered. It makes it possible, on one hand, to determine the presence of counterflows in the network, possible effusions of flows on the ground surface, volumes of runoffs running out, carrying capacity of a water disposal system and, on the other hand, to simulate various conditions of flow transportation with due regard for possible cloggings, encrustation of pipes and other violations which can occur during the operation.

Key words

, , , , , ,

 
Toggle Text

№4|2018

WATER DISTRIBUTION NETWORKS

bbk 000000

UDC 628.144

Luk'ianchuk M. Iu., Hyamyalyainen M. M., Smirnova S. V., JUDIN M. Iu.

Hydraulic model use-case in the operation of a water and wastewater services utility

Summary

Hydraulic models are used at the water and wastewater services utilities for addressing different tasks related to improving the operation of water distribution networks. Practitioners have been continuously looking for possible ways of using the models for daily needs of the utilities and their technical execution with the use of software. The advanced software includes an adequate number of functions that ensure completing routine tasks of water distribution network operation, management and development. An example of modeling a fault pipeline section shutoff with sequential valve shifting is presented; a method of basic data generation and presentation of the modeling results is shown. In the viewed example during the routine work execution the hydraulic head is slightly changed. During the pipeline section cutoff pressure monitoring in the control points of the pressure zone and additionally in the sections where pressure reduction is expected based on the results of modeling is carried out. In appropriate cases pressure reduction in the network can be balanced by increasing the output pressure of the pumping station. Changing flow directions will influence to a small extent separate network sections that could be additionally flushed before the cutoff. Following the pipeline cutoff procedure together with the recommendations based on the results of hydraulic modeling provides for eliminating the disruption of water supply to the customers.

Key words

, , , ,

 

vstmag engfree 200x100 2

mvkniipr ru

Российская ассоциация водоснабжения и водоотведения

Конференция итог

ecw20 200 300

VAK2