Kirkil, Gökhan
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K.,Gokhan
G. Kirkil
Kirkil,Gokhan
Kirkil,G.
GÖKHAN KIRKIL
Kirkil, Gokhan
K., Gokhan
Kirkil, G.
Gökhan KIRKIL
Kirkil G.
Gökhan Kirkil
Gokhan, Kirkil
KIRKIL, Gökhan
K., Gökhan
KIRKIL, GÖKHAN
Kirkil, GÖKHAN
Kirkil, Gökhan
Kirkil, Gökhan
Kirkil, Gökhan
G. Kirkil
Kirkil,Gokhan
Kirkil,G.
GÖKHAN KIRKIL
Kirkil, Gokhan
K., Gokhan
Kirkil, G.
Gökhan KIRKIL
Kirkil G.
Gökhan Kirkil
Gokhan, Kirkil
KIRKIL, Gökhan
K., Gökhan
KIRKIL, GÖKHAN
Kirkil, GÖKHAN
Kirkil, Gökhan
Kirkil, Gökhan
Kirkil, Gökhan
Job Title
Doç. Dr.
Email Address
Main Affiliation
Civil Engineering
Status
Current Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
13
CLIMATE ACTION
14
Research Products
2
ZERO HUNGER
0
Research Products
7
AFFORDABLE AND CLEAN ENERGY
16
Research Products
11
SUSTAINABLE CITIES AND COMMUNITIES
4
Research Products
15
LIFE ON LAND
0
Research Products
14
LIFE BELOW WATER
1
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
7
Research Products
3
GOOD HEALTH AND WELL-BEING
0
Research Products
5
GENDER EQUALITY
0
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
3
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
3
Research Products
16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
1
NO POVERTY
0
Research Products
6
CLEAN WATER AND SANITATION
0
Research Products
17
PARTNERSHIPS FOR THE GOALS
4
Research Products
4
QUALITY EDUCATION
2
Research Products
10
REDUCED INEQUALITIES
0
Research Products
Documents
39
Citations
1488
h-index
15
Documents
37
Citations
1431
Scholarly Output
40
Articles
18
Views / Downloads
11/0
Supervised MSc Theses
12
Supervised PhD Theses
0
WoS Citation Count
297
Scopus Citation Count
390
WoS h-index
7
Scopus h-index
8
Patents
0
Projects
0
WoS Citations per Publication
7.43
Scopus Citations per Publication
9.75
Open Access Source
26
Supervised Theses
12
| Journal | Count |
|---|---|
| Monthly Weather Review | 2 |
| Physics of Fluids | 2 |
| Energies | 2 |
| Computation | 2 |
| Applied Sciences-Basel | 1 |
Current Page: 1 / 5
Scopus Quartile Distribution
Competency Cloud
40 results
Scholarly Output Search Results
Now showing 1 - 10 of 40
Article Citation - WoS: 49Citation - Scopus: 57A Framework for Water and Carbon Footprint Analysis of National Electricity Production Scenarios(Pergamon-Elsevier Science Ltd, 2017) Shaikh, Mohammad A.; Küçükvar, Murat; Onat, Nuri Cihat; Kirkil, GökhanWhile carbon footprint reduction potential and energy security aspects of renewable and non-renewable resources are widely considered in energy policy their effects on water resources are mostly overlooked. This research aims to develop a framework for water and carbon footprint analysis to estimate the current and future trends of water consumption and withdrawal by electricity production sectors for national energy development plans - alongside carbon emissions from various electricity sources. With this motivation the Turkish electric power industry is selected as a case study and a decision support tool is developed to determine the water consumption withdrawal and carbon emissions from energy mixes under three different scenarios namely Business-As-Usual (BAU) Official Governmental Plan (OGP) and Renewable Energy-Focused Development Plan (REFDP). The results indicate that water is used substantially even by renewable resources such as hydroelectricity and biomass which are generally considered to be more environmental friendly than other energy sources. The average water consumption of the OGP energy mix in 2030 is estimated to be about 8.1% and 9.6% less than that of the BAU and REFDP scenarios respectively. On the other hand it is found that the water withdrawal of the energy mix in 2030 under the REFDP scenario is about 46.3% and 16.9% less than that of BAU and OGP scenarios. Carbon emissions from BAU are projected to be 24% higher than OGP and 39% higher than REFDP in 2030. Carbon emissions and water usage are strongly correlated in BAU scenario as compared with OGP and REFDP thus carbon friendly energy sources will result in fewer water consumptions and withdrawals particularly under REFDP. (C) 2017 Elsevier Ltd. All rights reserved.Conference Object Flow Structure in a Mixing Layer Developing Over Flat Bed at High Reynolds Numbers(Crc Press-Balkema, 2016) Kirkil, G.Results of a high resolution Detached Eddy Simulation (DES) are used to characterize the evolution of a shallow mixing layer developing between two parallel streams in a long open channel with a flat bed at a high Reynolds number (Re-D = 160,000). The influence of Reynolds number on the development of the mixing layer as well as the vertical non-uniformity in the mixing layer structure is discussed. The numerical results show that as Reynolds number increases, the mixing layer grows rapidly but also stabilizes more quickly. The shift of the centerline of the mixing layer is toward the low-speed side is less for high Reynolds number simulation than low Reynolds number simulation. Mixing layer growth rate and its change in the vertical direction are compared with experiments and a simulation at Re-D = 16,000. Passive scalar is introduced at the tip of the splitter plate close to the free surface to estimate the size of the mixing structures based on mass transport.Article Citation - WoS: 15Citation - Scopus: 23Students' Web-Based Activities Moderate the Effect of Human-Computer Factors on Their E-Learning Acceptance and Success During Covid-19 Pandemic(Taylor & Francis Inc, 2022) AL-Sayid, Fareed; Kirkil, GokhanThe purpose of this study is to investigate if students' activities on systems web-based moderate the effect of human-computer interaction (HCI) factors on ease of use and usefulness of e-learning and their success (SS) at the time of the COVID-19 pandemic. To answer the questions that addressed the relationship between HCI, e-learning acceptance, and SS, the researcher surveyed 103 students from Kadir Has University whose grade and activity logs were accessible. The survey was related to their perceived course webpage design, system and content quality, interactivity, usability and functionality, and self-assessment. The results show that most of the hypotheses of this study have been proven, a comprehensive conceptual model was developed, and the student grades in the online courses improved their GPA. The findings further reveal that students' activities moderate the effects of course environment and content quality on perceived usefulness and the effect of the course evaluation' system on perceived ease of use, where the changes in R-2 ranged between 0.041 and 0.074. That means including logs as a moderator would increase the explanatory power of the effect of HCI factors on e-learning acceptance which together explained 54.9% of the variance in perceived success (SS), where U is the strongest determinant of SS.Master Thesis Potential and Status of Renewable Energy Development in Energy Import-Dependent Countries Turkey and Pakistan(Kadir Has Üniversitesi, 2021) Majeed, Mohsina; Ediger, Şevket Volkan; Kirkil, GökhanHuman life cannot be imagined without the use of energy. Demand for energy, meanwhile, is increasing daily across the globe, while the uses and sources of energy have changed over time. Fossil fuels have dominated other energy sources since the 19th century but began causing problems such as climate change. In order to address these problems, renewable energy sources (RES) were accepted as an alternative energy sources in recent years and technical and economic developments make possible the energy transition from fossil fuels to renewables at an accelerated rate. Turkey and Pakistan are both developing countries with large populations and high levels of energy-import dependency, 77% and 80%, respectively. At the same time, Turkey and Pakistan both have enormous potential for RE such as solar, wind, hydro, biomass and geothermal, according to the validated RE-potential maps of these countries. Turkey and Pakistan are realizing renewable energy transition and seeking to shape their current energy structure in the favor of RES. The factors affecting RED in Turkey and Pakistan are enormous RE potential, supportive RE policies by government and energy security issues. There are some political, economic, technical and social problems for RED in Turkey and Pakistan that include lack of proper RE policies, extended and time-consuming governmental procedures, the lack of domestic production of goods, and other financing problems for RE projects. If proper policy support and efficient investment become available, RES can provide enough power to fulfill the country's energy demand and bring prosperity and sustainability to both countries. Current RED in these countries is not sufficient for complete energy transition from fossil fuels to renewables. However, RE potential in these countries is enough for complete energy transition. According to SWOT analysis Pakistan's RE sector has various investment opportunities for Turkish investors. It has a validated RE source mapping system and untapped highly potential solar and windy areas. Mini-hydro plants is also a successful RE business model in Pakistan. The government of Pakistan is also offering various incentives for RE investors. Keywords: Renewable energy transition, sustainability, solar, wind, fossil fuelMaster Thesis The Optical and Electrical Characteristics of Zno /Mos2 Transparent Oxide Composite Films(Kadir Has Üniversitesi, 2021) Al-Zubaidi, Shahad Tareq Radeef; Kirkil, Gökhan; Uysal, Bengü ÖzuğurOptoelektronikte saydam iletken oksit kullanımı, verimliliği düşürmeden veya maliyeti artırmadan esneklik, dayanıklılık ve taşınabilirlik becerisinin elde edildiği bir devrim yaratmaktadır. ZnO / MoS2 saydam iletken kompozit filmi basit bir süreç oluşu ve düşük maliyeti nedeniyle en önemli yöntem olarak kabul edilen sol-jel yöntemi ile üretilmiştir. ZnO / MoS2'nin kristal yapı özellikleri, X-Işını kırınım modeli (XRD) ile karakterize edilmiştir. XRD spektroskopisi ile, farklı miktarlarda MoS2 katkılı ZnO filminin kristal boyutu tayin edilmiştir. UV- görünür bölge absorpsiyon spektrometresi, filmin spektroskopik analizini gerçekleştirmek için kullanılmıştır. Absorpsiyon eğrisinin altındaki alan ve yarı maksimum absorbans verilerinin tam genişliği hesaplanmıştır. Bu değerle kullanılarak en iyi katkı maddesi dağılımı için MoS2 miktarı tespit edilmiştir. Ayrıca, en iyi saydam iletken malzemeyi belirlemek üzere, dört nokta prob yöntemi kullanılarak elde edilen direnç değerleri farklı MoS2 katkı miktarları için kıyaslanmıştır. Bu çalışmada, bir ZnO / MoS2 saydam iletken oksit filmin optik ve elektrik karakterizasyonlarını incelenmiştir.Conference Object Citation - Scopus: 1Genesys-Mod Turkey: Quantitative Scenarios for Low Carbon Futures of the Turkish Energy System(IEEE Computer Society, 2022) Hasturk, I.S.; Celebi, E.; Yucekaya, A.D.; Kirkil, G.This paper examines the quantitative scenarios for low-carbon futures of the Turkish energy system at aggregated (country level) and regionally disaggregated (NUTS-1 level) levels. We have employed four different storylines for the future European energy system. They are quantified and implemented for the European energy system (30 regions, mostly single countries, including Turkey) using the open-source global energy system model, GENeSYS-MOD v3.0. We have compared the results of all scenarios at aggregated and disaggregated levels and found that there are significant differences among them. Specifically, the hydrogen production (and its use) has increased considerably in the disaggregated model when compared to the aggregated level results. The major reason for these differences is found to be the better estimation of regional renewable capacity factors (wind and solar) in the disaggregated level compared to aggregated level. © 2022 IEEE.Article Citation - WoS: 37Citation - Scopus: 42Turkish Public Preferences for Energy(Elsevier Science, 2018) Ediger, Volkan S.; Kirkil, Gökhan; Çelebi, Emre; Ucal, Meltem Şengün; Kentmen-Cin, ÇiğdemPublic concern over energy supplies prices sustainability and efficiency has emerged as a major issue around the world. Yet most of what we know regarding public opinion on energy comes from North America and Europe. This paper presents the results from the 2016 Turkish Public Preferences for Energy Survey which included 1204 respondents and examined Turkish residents' household energy consumption energy policy preferences and environmental concerns. The main findings were that Turkish citizens consider natural gas and electricity highly expensive view dependence on imported energy as Turkey's most pressing energy challenge and recognize the problem of climate change. This lends public support for wind and solar power but at the same time energy issues and the environment policies of political parties do not affect voting choices and political preferences.Master Thesis Decarbonization Pathways For Turkish Power System Using The Leap Model Leap Modeli Kullanılarak Türkiye Elektrik Sistemi için Dekarbonizasyon Yolları(Kadir Has Üniversitesi, 2021) Özer, Fatma Ece; Kirkil, Gökhan; Yücekaya, Ahmet DenizThe negative impact of GHG released into the atmosphere on global warming cannot be ignored. Fossil-fueled power plants constitute a large part of Turkey's electricity production, as every country has a growing economy. Therefore, the electricity generation sector accounts for a significant portion of GHG emissions in Turkey. In addition to national bindings such as the Paris Agreement and the Kyoto Protocol, it is known that the Republic of Turkey aims to make not only electricity but also energy production greener in the coming years, in line with its own efforts. For this purpose, there are different modeling studies in the literature. This thesis aims to model Turkey's electricity generation sector in 2017, reveal the current situation, and then analyze how a greener and sustainable energy transformation will be possible with different scenarios and different main factors. In this direction, Turkey's electricity generation sector was modeled using the LEAP tool, then the decarbonization scenarios created within the openENTRANCE project were adapted to Turkey's data, and the numerical results of the scenarios were compared. As a result, it has been revealed that social awareness, adaptation to new technologies, and incentives of decision-makers are all critical factors in this regard.Article Citation - WoS: 50Citation - Scopus: 59A Numerical Study of the Laminar Necklace Vortex System and Its Effect on the Wake for a Circular Cylinder(Amer Inst Physics, 2012) Kirkil, Gökhan; Constantinescu, GeorgeLarge eddy simulation (LES) is used to investigate the structure of the laminar horseshoe vortex (HV) system and the dynamics of the necklace vortices as they fold around the base of a circular cylinder mounted on the flat bed of an open channel for Reynolds numbers defined with the cylinder diameter D smaller than 4460. The study concentrates on the analysis of the structure of the HV system in the periodic breakaway sub-regime which is characterized by the formation of three main necklace vortices. Over one oscillation cycle of the previously observed breakaway sub-regime the corner vortex and the primary vortex merge (amalgamate) and a developing vortex separates from the incoming laminar boundary layer (BL) to become the new primary vortex. Results show that while the classical breakaway sub-regime in which one amalgamation event occurs per oscillation cycle is present when the nondimensional displacement thickness of the incoming BL at the location of the cylinder is relatively large (delta*/D > 0.1) a new type of breakaway sub-regime is present for low values of delta*/D. This sub-regime which we call the double-breakaway sub-regime is characterized by the occurrence of two amalgamation events over one full oscillation cycle. LES results show that when the HV system is in one of the breakaway sub-regimes the interactions between the highly coherent necklace vortices and the eddies shed inside the separated shear layers (SSLs) are very strong. For the relatively shallow flow conditions considered in this study (H/D congruent to 1 H is the channel depth) at times the disturbances induced by the legs of the necklace vortices do not allow the SSLs on the two sides of the cylinder to interact in a way that allows the vorticity redistribution mechanism to lead to the formation of a new wake roller. As a result the shedding of large-scale rollers in the turbulent wake is suppressed for relatively large periods of time. Simulation results show that the wake structure changes randomly between time intervals when large-scale rollers are forming and are convected in the wake (von Karman regime) and time intervals when the rollers do not form. When the wake is in the von Karman regime the shedding frequency of the rollers is close to that observed for flow past infinitely long cylinders.Article Citation - WoS: 9Citation - Scopus: 11Large Eddy Simulation of Wind Flow Over a Realistic Urban Area(MDPI, 2020) Kirkil, Gökhan; Lin, Ching-LongA high-resolution large eddy simulation (LES) of wind flow over the Oklahoma City downtown area was performed to explain the effect of the building height on wind flow over the city. Wind flow over cities is vital for pedestrian and traffic comfort as well as urban heat effects. The average southerly wind speed of eight meters per second was used in the inflow section. It was found that heights and distribution of the buildings have the greatest impact on the wind flow patterns. The complexity of the flow field mainly depended on the location of buildings relative to each other and their heights. A strong up and downflows in the wake of tall buildings as well as large-scale coherent eddies between the low-rise buildings were observed. It was found out that high-rise buildings had the highest impact on the urban wind patterns. Other characteristics of urban canopy flows, such as wind shadows and channeling effects, are also successfully captured by the LES. The LES solver was shown to be a powerful tool for understanding urban canopy flows; therefore, it can be used in similar studies (e.g., other cities, dispersion studies, etc.) in the future.
