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Lattice Boltzmann Study of Flow Fields Around Stationary and Oscillatory Cylindrical Objects in Various Arrangements

Thesis Info

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Author

Shigri, Sehrish Hassan

Program

PhD

Institute

COMSATS University Islamabad

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Mathemaics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/9700/1/Sehrish_Hassan_Shigri_Maths_2019_CIIT_15.05.2019.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726578919

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Computational fluid dynamics is a fascinating and complex subject due to rapid development of computer technology, high level programming languages and new developed numerical techniques for unlimited set of different engineering applications. The study of wake structure mechanism behind the cylindrical objects is important for practical applications in wind engineering, aerodynamics, and electronics cooling. The main objective of this study is to systematically investigate the stationary and oscillatory flow problems using the lattice Boltzmann method. The oscillating flow fields are common flow fields in many practical situations like ocean engineering, off-shore structures and similar type of bodies located in a wave environment. Oscillatory motions of small amplitude are very important in the analysis of immersed vibrating bodies. Such motions alter the aerodynamic forces and the pressure distributions as compared to those of rigid body.This may also result to the lock-in phenomenon, where the shedding frequency of fluid becomes equal to the oscillating frequency of the object. On the other hand the oscillatory motions of larger amplitude alter the far flow fields which can be affective due to the presence of other bodies in the flow field. Therefore detailed information regarding the variations of flow fields due to oscillatory motions is very important for designing structures. This study will focus on three main points: (a) Flow past stationary cylinder at various arrangements, (b) Drag reduction in terms of small control cylinders (c) Flow characteristics of oscillatory cylinder arranged in side-by-side or tandem. All these results, most of which have been obtained for the very first time, are of fundamental significance in engineering applications
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ہوائے دید کا چلنا تمھیں مبارک ہو

ہوائے دید کا چلنا تمھیں مبارک ہو
قفس زدوں کا مچلنا تمھیں مبارک ہو

ہمارے ہاتھ لگے ہو خریدیں کیوں نہ تمھیں
نگاہِ ناز پہ بکنا تمھیں مبارک ہو

میں حسن زادہ ہوں، کنعاں وطن سے آیا ہوں
کہ مجھ پہ تہمتیں دھرنا تمھیں مبارک ہو

مرا نصیب کہ مجھ پر نگاہ بھی نہ ہوئی
مرا وہ ہاتھ یوں ملنا تمھیں مبارک ہو

وہ اک نظر کہ شرابوں کے جام جیسی ہے
اب اس سے پینا ، بہکنا تمھیں مبارک ہو

Islam and Woman in the Contemporary Arab World: An Interpretation of Rajaa Al-Sanea’s Girls of Riyadh from Islamic Feminist Perspective

The present position paper explores to examine Rajaa al-Sanea’s“Girls of Riyadh” (2005) from the Islamic feminist perspective. Also, the study highlights the model of western feminism epitomised in the narrative under reference, vis-à-vis the Islamic concept of feminism. Islamic feminism grants equal rights to women and ensures its implementation in the Islamic state and society, whereas Western-sponsored feminism dwells on the archetype of women’s liberalism. That, in turn, leads to an anarchic and chaotic society, because of its believing in bringing women not only equal to men but superseding them in socio-cultural positioning. In the existing situation, the novel decries phallocentric society of Saudi Arabia and aiming at replacing it by the sensate-secular feminism that believes in the undue autonomy of the women. In order to investigate the presence of overwhelming patrilineal mores, the study pursues Islamic feminism as a theoretical model and employs reader’s response technique as a methodology. More far the findings of the research are concerned, the researchers conclude that replacing the patriarchal autonomy in the said society by Islamic feminism is befitting and benefitting than to replace it by the western feminism.

Comparative Reference Values of Somatic Cells, Enzymes and Some Biochemical Constituents in the Milk from Uninfected Mammary Glands of Nili-Ravi Buffaloes, Sahiwal and Cross-Bred Cows.

Pakistan is among the top milk producing countries of the world. However, the quality control standards for milk have not as yet been established. The present study was conducted to establish the normal reference values of milk somatic cell counts (SCC), different milk enzymes and other important milk constituents in non-infected milk of Nili-Ravi buffaloes, Sahiwal and cross-bred cows. The milk samples from 30 animals (in the first two months of first to 5th lactation) of each group were collected from Livestock Experimental Station, University of Agriculture, Faisalabad and commercial dairy farms and tested for mastitis using Surf Field Mastitis test and microbiological examination and negative samples were used to establish the reference values. Milk samples were analyzed for different parameters like pH, electrical conductivity (EC), SCC, milk enzymes i.e. lacto-peroxidase (LPO), superoxide dismutase (SOD), guaiacol peroxidase (GPO), catalase (CAT), protease, amylase, α-esterase, NAGase, total phenolic contents (TPC), proteins and malondialdehyde (MDA) content and reference values were established. Total protein (81.6±2.0 mg mL-1), casein (71.4±1.2 mg mL-1), TPC (2381.6±71.85 μM mL-1), total oxidant status (TOS) (61.25±0.59 μM mL-1), protease (81.3±3.35 U/mL), CAT (97.45±4.8 U/mL), LPO (1.75±0.06 U/mL), NAGase (56.07±2.33 U/mL) and SCC (178645.83±2324.0 mL-1) were the highest in milk of crossbred cows. Whey protein (28.8±1.25 mg mL-1), GPO (110.74±8.64 U/mL), SOD (17.15±0.56 U/mL), amylase (89.44±2.51U/mL), EC (5.7±0.04) and MDA (2.27±0.07 μM mL-1) was the highest in Sahiwal cow’s milk. Total antioxidant capacity (TAC) (3.296±0.005 mM L-1) and α-esterase (361.19±13.63 U/mL) activity were the highest in milk of Nili-Ravi buffaloes. The SCC negatively correlated with TOS, TAC, Lacto-serum protein and α-esterase activity while NAGase with lacto-serum protein and amylase, therefore, their higher values can be used as indicators of good milk quality. SCC and NAGase positively correlated with TPC, CAT and LPO. As such their lower values seem to be associated with better udder health and good milk quality. GPO and SOD negatively correlated with TOS, TAC, total protein, casein and α-esterase activity but positively correlated with amylase, EC, SCC, MDA and lacto-serum protein therefore, their lower values in milk may be desirable. Milk quality of Nili-Ravi was comparatively superior based on lower values of SCC, EC, NAGase, CAT, GPO, SOD, TPC, protease and higher TAC. Protein profiling through SDS-PAGE clearly resolved the major milk peptides. In high molecular weight (M. wt.) zone, proteins of ~208 kDa and ~190 kDa were detected in all tested samples. In medium M. wt. zone, three peptides i.e. lactoferrin (78.2kDa), serum albumin (66.2kDa) and heavy chain of immunoglobulin (IgG) (54 kDa) were detected in all samples while a prominent band of ovalbumin (45kDa) was also detected mainly in cow milk samples. In low M. wt. zone, clear bands of milk caseins were detected. All four casein (CN) bands i.e. αS2 – CN (29 kDa), αS1 – CN (27 kDa), β - CN (24 kDa) and κ- CN (22 kDa) were detected in Sahiwal and cross-bred cows. However, in milk of Nili-Ravi buffaloes, three casein protein i.e. αS2 – CN (29 kDa), β - CN (25 kDa) and κ- CN (22 kDa) were detected. In milk of Nili-Ravi buffaloes, αS1 – CN (27 kDa) was not detected. Moreover, a band of β-lactoglobulin (~18 kDa) was detected in milk of cross-bred cows and not in other samples especially those of Nili-Ravi buffaloes. As the αS1-casein and β-lactoglobulin are the major allergens, milk of Nili- Ravi buffaloes that lacks these peptides can be used for development of hypoallergenic or non-allergic dairy products. Deferential peptides may also help to differentiate the milk from different tested dairy species/cow types.