### Mathematical modelling of aeroacoustics and metal forming

Fluids and Materials Seminar

15th November 2018, 2:00 pm – 3:00 pm

Main Maths Building, SM3

Aeroacoustics is the study of sound generated by airflow, typically in

an aircraft engine but with applications to car noise and wind turbine

noise, among others. This part of this talk will concentrate on models

for acoustic linings that absorb sound. We will see how the model for

the last 40 years is provably wrong (ill-posed), what we can do about

it, and how even today we do not have a good predictive model for sound

absorption by a surface in an airflow.

Metal Forming is bending bits of metal into the right shape. It is how

most things from coke cans to cars are made. Finite element analysis is

the tool of choice for engineers, but it is not fast enough for

real-time control of metal forming processes; so these processes are not

controlled. With a controlled metal forming process, we could make

parts we can't today; we could reduce the energy needed to make parts;

we could use more recycled metal; and, possibly, we could build machines

that can make more than one part. The missing ingredient is a

sufficiently accurate, sufficiently quick model of how metal forms,

which is where mathematical modelling can help. This part of this talk

will look at some recent attempts by my group at mathematical modelling

of some simple metal forming processes.

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