[TECH TIPS Simcenter Amesim] Optimizing vehicle thermal comfort using CFD

[TECH TIPS Simcenter Amesim] Optimizing vehicle thermal comfort using CFD


Hello, I am Alberto Soto with Siemens PLM Software.
Today, I am going to present the Embedded CFD Cabin capability
in Simcenter Amesim.
This capability smartly combines
Simcenter Amesim with the 3D CFD approach
of Simcenter STAR-CCM+,
and it helps you assess and optimize
vehicle thermal comfort
thanks to a configurable 3D multi-zone cabin model.
Let’s take a look at how it works.
Embedded CFD is aimed at bringing
a more detailed air flow representation
at early design stages:
using a simplified parameter-based geometry;
with the power of Simcenter STAR-CCM+;
or keeping short simulation times.
Let’s take a look at how the Embedded CFD Cabin capability works.
This 10 air-zone, predefined model,
can be found in the Heat Exchanger Assembly Tool library.
A dedicated app is associated with the supercomponent.
You can use this app to change parameters,
define the inner and outer cabin dimensions;
as well as the position and orientation
of the different air vents.
It also allows you to automatically build
the corresponding 3D CFD model,
according to these parameters and boundary conditions.
The ready-to-use template,
available in the demo section,
is an example of a cool-down scenario:
with an initial cabin temperature of 60 degrees Celsius
and a car running at a constant speed.
The air from the evaporator
is distributed throughout the different air vents.
The air humidity,
as well as the heat transfers with the cabin walls,
windows and seats,
are taken into account by the model.
The 3D CFD air flow calculations
supply the air mass flow transfers between the zones,
as well as the inner heat transfer-coefficients
to the system simulation model.
In return, the system model
supplies the wall temperatures and other boundary conditions,
such as mass flows and temperatures at the air vents.
After 500 seconds of simulation,
we can look at the temperature evolution
in each of the 10 zones.
We can also observe some 3D post-processed views,
such as streamlines
or air velocity at the driver’s seat.
The simulation time for this transient-run is short,
since it takes only 13 minutes to complete it,
thus representing about one and a half times
the simulated time.
You can, of course, go further with your model
by adding, for example,
a Simcenter Amesim refrigerant loop
and other HVAC elements to your system,
so as to have better insight into air flow distribution
and recirculation strategies.
To sum up,
the Embedded CFD Cabin capability
in Simcenter Amesim
brings a new dimension to the car cabin
thermal-comfort evaluation,
at early design stages.
You can easily set up and run a 3D
multi-zone cabin model,
so as to rapidly assess different warm-up strategies,
vent positions and recirculation strategies.
Thank you for watching.
For more information, please visit our website.

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