ORALS

SESSION: PhysicsMonPM1-R4	Virk International Symposium (Intl Symp on Physics, Technology & Interdisciplinary Research for Sustainable Development)
Mon. 28 Nov. 2022 / Room: Arcadia 3
Session Chairs: Hovav Zafrir; Session Monitor: TBA

14:25: [PhysicsMonPM106] OL
Nobel Laureate Peter Kapitza
Bhadra Tuladhar¹ ; ¹Kathmandu University, Kavre, Nepal;
Paper Id: 314 [Abstract]

Russian Physicist Peter Kapitza (1894-1984) was the young scientists attracted to work with Ernest Rutherford and gained a doctorate in Physics in July 1923 from Cambridge. He graduated from Petrograd Polytechnical Institute in 1919 and was awarded the degree of Engineer-Electrician. The Physico-mechanics faculty of the Institute was at that time headed by Abram Fedorovich Joffe. In Cambridge, Kapitza started Physics Seminar from 1922 which was later named as “Kapitza Club”. In 1930, chemist and industrialist Ludwig Mond donated the required fund to London Royal Society for the construction of a specialized laboratory exclusively for research work of Kapitza. He lived and work in Cambridge till 1934. In 1935, Kapitza created The Institute for Physical Problems in Moscow and worked as its director. He was awarded the Nobel Prize in Physics in 1978. He the died on April 8, 1984 in Moscow. I will talk about the family tragedy of December 1919, the work and stay in Cambridge, work in Moscow, quotes from the Nobel speech, my several visit to him in Moscow and finally, the Kapitza Memorial Museum in Moscow.

References:
[1] P. L. Kapitza, Experiment Theory Practical, Moscow, 1979 (in Russian)
[2] Peter Leonidovich Kapitza, Memories Letters Documents, Russian Academy of Science, 1994 (in Russian)

SESSION: MathematicsWedPM1-R4	5th Intl. Symp. on Sustainable Mathematics Applications
Wed. 30 Nov. 2022 / Room: Arcadia 3
Session Chairs: Simone Beghella Bartoli; Bhadra Tuladhar; Session Monitor: TBA

15:15: [MathematicsWedPM108] OL
Model Development and Simulations in Multiphase Landslide, Debris Flows and Avalanches
Bhadra Tuladhar¹ ; ¹Kathmandu University, Kavre, Nepal;
Paper Id: 313 [Abstract]

To make the earth a better place to live in as the ultimate goal for the sustainable development, mankind has to understand different earth processes and their dynamics. Nepal is a mountainous country where landslide, debris flow, land tsunami and other gravitational mass flow hazards claim many human lives every year. For the prevention and mitigation of such hazards, systematic study of such events is needed. We discuss our modeling and simulation techniques related to different gravitational mass flows, especially with physics-based two-phase mass flow model [1]. We discuss our attempts to model Glacial Lake Outburst Floods (GLOFs), in three different initial and boundary conditions for the lake geometry, volume, and conduits. The results reveal different interesting flow dynamics of the solid and fluid-phases, lake-emptying process and levee formation during the flow [2]. We also discuss the interaction of two-phase debris flow with obstacles of different orientations and number at different locations of the flow path. The results show many naturally inline phenomena, like flow redirection, formation of vacuum behind the obstacles and the phase-separation. The computation of the novel barycentric impact pressures computed from the separate phasic impact pressures are important for the design of the structural mitigation measures [3]. For the flow through laterally converging channels, we relate the flow obstruction and the contraction ratio. We also discuss our full dimensional model developed for the modeling of bulk mixture of solid and fluid [4] and simulate the dry and wet snow avalanches of different water contents [5]. In the unified modeling and simulation techniques, we also discuss the dynamics of subaerial and partially submerged landslide and the interaction with a fluid reservoir downstream. The resulting short land tsunami wave generation, amplification and propagation along with the submarine mass movement [5, 6]. The different physics, mechanics and dynamics of the solid and fluid phases in the gravitational mass flows as revealed in our models and simulation results have enriched our understanding in the multiphase geophysical mass flow processes.

References:
[1] S.P. Pudasaini, J. Geoph. Res. 117, F03010 (2012).
[2] P. Kattel, K.B. Khattri, P.R. Pokhrel, J. Kafle, B.M. Tuladhar, S.P. Pudasaini, Ann. Glaciol. 57(2016) 349-358.
[3] P. Kattel, J. Kafle, J.-T. Fischer, M. Mergili, B.M. Tuladhar, S.P. Pudasaini, Eng. Geology. 242 (2018) 197-217.
[4] P.R. Pokhrel, K.B. Khattri, B. M. Tuladhar, S.P. Pudasaini, Int. J. Non-Lin. Mech. 99(2018) 229-239.
[5] K.B. Khattri, J.-T. Fischer, B. M. Tuladhar, M. Jaboyedoff, S.P. Pudasaini, Proc. ISSW-International Snow Science Workshop (2018).
[6] J. Kafle, P.R. Pokhrel, K.B. Khattri, P. Kattel, B.M. Tuladhar, S.P. Tuladhar, Ann. Glaciol., 57 (2016) 232-244