Building cities of the future
A look at the past, present and the future of Civil Engineering
Krishna Kumar, kks32@cam.ac.uk
University of Cambridge / UT Austin (Jan 2019)
2nd November 2018
Civil Engineering: From the past to the present
Fan vaults at King's
From arches to fan vaults
Catenary
Sagrada familia
Suspension bridges
Catenary v Parabola
Tacoma narrow bridge collapse
Millenium bridge
Structural monitoring
Distributed Brillouin Sensing
Victoria station upgrade
Post Office tunnel
Agent Based Modelling of cities
Soga et al., (2017)
Network analysis of Herpes Simplex Virus (HSV2)
Paranthropus boisei is the intermediary species that gave humans herpes!
(Underdown et al., 2017)
(Underdown et al., 2017)
The usual suspects
Cellular Automata modelling of disease
What are these stacks in Egypt?
Ground Source Heat Pumps
Behaviour of soil under different conditions
Everyone is a geotechnical engineer!
Where to build the perfect sand castle?
Stresses in solid
Visualising effective stresses in soil
https://www.youtube.com/watch?v=Z6rvdkI4T8I
Capillary rise
Building the perfect sand castle
Can we build an underwater sand castle?
Using hydrophobic sand: The force between beads remain constant, but the effective weight of the sandcastle is reduced by a factor of 3.
What happens when you squeeze the balloons?
What happens when you squeeze: soil vs water?
Shear-induced dilation
Why do dogs dig shallow pits?
Scales in modelling soil
Discrete Element Method
Grain-scale simulation of soil
Applications of DEM
Disney's Frozen: Snow simulation
MPM submarine landslide
Depth-averaged Material Point Method (Taka et al., 2012)
CPU v GPU
GPU
CPU v GPU
Super computing
LBM - DEM a = 0.8 & 10,000 particles
- LBM Nodes = 50 Million : DEM grains = 10000 discs
- Run-time = 4 hours
- Speedup = 125x on a Pascal P100
Collapse on an inclined plane
aspect ratio 'a' of 6 on a slope of 5*
Fluid structure interaction
Modelling soil is out of this world!
Behaviour of martian soil
Modelling soil is out of this world!
CalTech
Building the cities of the future!
