Blog : What's new ?

As part of our commitment to environmental sustainability, we are certified in accordance with ISO 14001:2004. Thus, we monitor our environmental impacts and try to reduce them. For impacts related to travels (visits to customers, training courses, conferences), these are difficult to reduce without damaging our business, so we act through carbon contribution.

We have contributed up to 100% (plus an extra donation due to few travels during the pandemic) of our travels emissions of year 2021 by funding the project "Energy and ecological transition for a sustainable agriculture" by the Geres association. You can find more details about this project on their website and in this document.

Set up in 1976, Geres is a development NGO working in Europe, Africa and Asia to improve living conditions and fight against climate change and its impacts. As a field player, the energy transition is a major lever in their action in favor of greater climate solidarity.

The EXTENDE team.

While CIVA validation tests are constantly being performed, a specific effort has been done by the CEA and EXTENDE teams in the period 2010-2017 in comparing a lot of simulation results obtained by CIVA UT (and also ET and RT) with experimental trials. These results (published on our website and also in different conference papers) give credit to the accuracy of CIVA models in many situations.

The goal of this work was also to highlight the discrepancies observed when reaching the limitations of semi-analytical models, so that users can be aware about validity domains of CIVA.

Release after release, CIVA includes new features but also new models.

In particular, new FEM models have been integrated recently in CIVA UT, which lead us to update some of our validation works in order to evaluate the improvement brought by these new models. Take a look at our website to update your knowledge about CIVA accuracy and limitations!

You may focus on the following pages, in which updated result have been highlighted in bold:

UT - Corner echoes with SV mode: Generalities
UT - Corner echoes with SV mode: Influence of the notch height
UT - Corner echoes with sv mode: Simultaneous influence of the notch length and the refraction angle
UT - Corner echoes with sv mode: Conclusion and phenomena explication

The EXTENDE team.