689 research outputs found
Real Time Wake Computations using Lattice Boltzmann Method on Many Integrated Core Processors
This paper puts forward an efficient Lattice Boltzmann method for use as a wake simulator suitable for
real-time environments. The method is limited to low speed incompressible flow but is very efficient and
can be used to compute flows “on the fly”. In particular, many-core machines allow for the method to be
used with the need of very expensive parallel clusters. Results are shown here for flows around
cylinders and simple ship shapes
Real Time Wake Computations using Lattice Boltzmann Method on Many Integrated Core Processors
This paper puts forward an efficient Lattice Boltzmann method for use as a wake simulator suitable for
real-time environments. The method is limited to low speed incompressible flow but is very efficient and
can be used to compute flows “on the fly”. In particular, many-core machines allow for the method to be
used with the need of very expensive parallel clusters. Results are shown here for flows around
cylinders and simple ship shapes
Molecular dynamics simulations of complex systems including HIV-1 protease
Advances in supercomputer architectures have resulted in a situation where many scienti�fic codes are used on systems whose performance characteristics di�ffer considerably
from the platform they were developed and optimised for. This is particularly apparent
in the realm of Grid computing, where new technologies such as MPIg allow researchers
to connect geographically disparate resources together into virtual parallel machines.
Finding ways to exploit these new resources efficiently is necessary both to extract the
maximum bene�fit from them, and to provide the enticing possibility of enabling new science. In this thesis, an existing general purpose molecular dynamics code (LAMMPS)
is extended to allow it to perform more efficiently in a geographically distributed Grid
environment showing considerable performance gains as a result.
The technique of replica exchange molecular dynamics is discussed along with its applicability to the Grid model and its bene�fits with respect to increasing sampling of configurational space. The dynamics of two sub-structures of the HIV-1 protease (known
as the
flaps) are investigated using replica exchange molecular dynamics in LAMMPS
showing considerable movement that would have been difficult to investigate by traditional methods.
To complement this, a study was carried out investigating the use of computational tools
to calculate binding affinity between HIV-1 protease mutants and the drug lopinavir in
comparison with results derived experimentally by other research groups. The results
demonstrate some promise for computational methods in helping to determine the most
eff�ective course of treatment for patients in the future
Real-time Flexibility Feedback for Closed-loop Aggregator and System Operator Coordination
Aggregators have emerged as crucial tools for the coordination of distributed, controllable loads. However, to be used effectively, aggregators must be able to communicate the available flexibility of the loads they control to the system operator in a manner that is both (i) concise enough to be scalable to aggregators governing hundreds or even thousands of loads and (ii) informative enough to allow the system operator to send control signals to the aggregator that lead to optimization of system-level objectives, such as cost minimization, and do not violate private constraints of the loads, such as satisfying specific load demands. In this paper, we present the design of a real-time flexibility feedback signal based on maximization of entropy. The design provides a concise and informative signal that can be used by the system operator to perform online cost minimization and real-time capacity estimation, while provably satisfying the private constraints of the loads. In addition to deriving analytic properties of the design, we illustrate the effectiveness of the design using a dataset from an adaptive electric vehicle charging network
Real-time Flexibility Feedback for Closed-loop Aggregator and System Operator Coordination
Aggregators have emerged as crucial tools for the coordination of
distributed, controllable loads. However, to be used effectively, aggregators
must be able to communicate the available flexibility of the loads they control
to the system operator in a manner that is both (i) concise enough to be
scalable to aggregators governing hundreds or even thousands of loads and (ii)
informative enough to allow the system operator to send control signals to the
aggregator that lead to optimization of system-level objectives, such as cost
minimization, and do not violate private constraints of the loads, such as
satisfying specific load demands. In this paper, we present the design of a
real-time flexibility feedback signal based on maximization of entropy. The
design provides a concise and informative signal that can be used by the system
operator to perform online cost minimization and real-time capacity estimation,
while provably satisfying the private constraints of the loads. In addition to
deriving analytic properties of the design, we illustrate the effectiveness of
the design using a dataset from an adaptive electric vehicle charging network.Comment: The Eleventh ACM International Conference on Future Energy Systems
(e-Energy'20
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