Hi @yw5aj,
there are several ways how you can do that.
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Online: In the result control in addition to the solution fields where you added the reaction force, there are items called edge-, area- and volume calculation as well as point data. All of those create plots from some processed data (sum, min/max, average) on the specified entities. There you could add an area calculation on the fixation faces and compute the sum of the reaction forces, the total reaction force. This will create a plot with the reaction forces after the calculation is finished. Unfortunately at the moment you have to re-compute the full calculation to add such a plot after the initial run was finished.
Here is the corresponding documentation link: SimScale Documentation | Online Simulation Software | SimScale
And a related forum post by @ahmedhussain18 where those items are also explained: [Result Control] Calculation methods on specific entities and their differences
And a public project by @BenLewis, where several result control items have been used to compute, amongst others, the reaction forces[!!!THIS LINK IS NO LONGER AVAILABLE!!!] -
Offline: In local ParaView there are several ways how you can do that. For example you can use the extract blocks filter to reduce the computation to only a part of the model (fixation faces for example) and then use a calculator filter where you can simply use the SUM operator to compute the total force. This forum conversation might also be helpful: How to get nodal solution results?
Hope this helps!
Best,
Richard