Imagine you have two 3D PDE to solve by COMSOL. The answer of first one will later replace as position dependent variable in second physics. There is two option. One way to do that is to export the answer from “Data Export” as a txt file and later import it in second COMSOL model by “interpolation”. Other way is to have two physics in one model and connect them by “Value of variable not solved for “in the sitting of “study”. Unfortunately, there is problem with first way and the result at the end is not same. For some reason I have to do the first option. When I import the data in second model and got the plot from the “interpolation” window everything is fine. After I noticed the answer is not what it supposed to be, I tried to plot the imported variable on “Results” from “solution2“ and I found that there is a hell of difference between what I imported and what is read from those data. I don’t need interpolation. I will use same mesh. Therefore I just need to import a 3D variable correctly. The imported data is quite nonlinear.
I would appreciate if anybody give me a suggestion about either importing 3D variable without interpolation or solving this problem?
I found the answer by myself . Fr one who might have the same problem.
I should changed the "extrapolation" from the Linear to the Nearest neighbor.
I recommend contacting the techinal support team @COMSOL Multiphysics to help answer any COMSOL related questions http://www.comsol.com/support. Their team of experts will guide you through the modeling process.
Hi Sofie
It is interesting because I had the same problem. I like to use [nm] but I noticed the simulation will not perform well. So I gave up and just used [m]. At the first I was thinking that the export/import would take too much time but now I see the time that is passed for single iteration is much more that import/export time. Considering the number of iterations that I need, this method for data import/export is good enough. :-)
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