Dear Professor Miamal, we are looking forward to your talk.

Yes, thanks a lot for the nice introduction.

So I would like to give a talk about multiphysics systems and the question how we can deal with

it on the modeling side and at the same time keep simulation control in the picture.

So let me start with some general remarks.

So if you look at modern key technologies, then this definitely requires modeling and

simulation and optimization and control of dynamical systems and they are typically very

complex.

And most real world systems are multiphysics systems in the sense that they combine different

physical domains and these typically come with different accuracies and different scales

in the components.

In many, in particular engineering domains, modeling becomes exceedingly automatized.

So you build a complicated system from subsystems or you combine numerical methods in a network-based

fashion.

And when it comes to the practical application, a new buzzword is digital twins.

So to try to mimic the behavior of the system during the whole lifetime.

So by adapting the equations, the model equations to the behavior of the system.

And my personal opinion is that modeling, analysis, numerics, control and optimization

and also nowadays data science techniques, they should go hand in hand.

And also model reduction is an important topic in particular for data assimilation, optimization

and control.

And in this framework, I would like to give this talk.

But let me start with a very important topic for the coming years.

And this is on the energy market is the sector coupling.

So we all know that we're going into more and more renewable power generation, so wind

and solar.

At the same time, we have to provide the households and also the companies with heat for the,

to come through the winter and in some areas also cooling to come through the summer.

And at the same time, we have the transport sector, which is strongly going electric.

So there is this coupling power to heat and power to mobility.

And there are many other couplings that we have to deal with.

And let me give you a few examples that we're working on.

So one project that we're currently working on is together with the universities in Trier

and the Fraunhofer Institute in Kaiserslautern and as a company, the Stadtwerke Ludwigshaben,

which have a district heating plant.

And the district heating is usually fed with waste incineration.

So you burn garbage and produce heat.

And with this, you heat the water, then you send it to the household.

But that may not be very cost effective or ecologically good in the future.

So as a consequence, you have to combine it with electrical and also gas heating from

gas and from electricity.

And that you feed into the system.

And so for example, here is a little example.

So you have a up here, you have a station which heats up the water, then it's sent through

the street to all the household.

And there's two networks.

There's a hot network and there is a cool network.

So the hot water comes in with something like 84 degrees and it goes, is sent back with

60 degrees.

And so this is a complicated system, in particular if you have many households.