HYDRUS 1D Model Fails to Converge

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hhfang
Posts: 7
Joined: Thu Mar 14, 2019 1:51 pm
Location: Germany

Re: HYDRUS 1D Model Fails to Converge

Post by hhfang » Fri Mar 27, 2020 9:08 am

Dear professor Jirka,
Thank you very much for the reply! Actually I tried, but I got two different output in the end (as shown in the Fig.1 and Fig.2).
I ran HYDRUS 1D with a single layer as the reference case. I added Alfa2 , n2, but set w2 =0 in the SELECTOR.IN file, and ran HYDRUS again with all exact the same input files and settings (Fig.3). I compared the results and found that they are different in the end. But I also notice that the observed node in the deep layer(131 and 211) already show difference in the beginning at the time 10 sec (Fig.1). Do I miss or misunderstood something?
Thanks a lot for the help!

Fig.1
out1.PNG
out1.PNG (361.49 KiB) Viewed 486 times
Fig2.
out2.PNG
out2.PNG (102.16 KiB) Viewed 486 times
Fig3.
selectorin.PNG
selectorin.PNG (100.71 KiB) Viewed 486 times
Attachments
SELECTOR.txt
(1.85 KiB) Downloaded 13 times
SELECTOR-ref.txt
(1.77 KiB) Downloaded 10 times

Jirka
Posts: 4921
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Re: HYDRUS 1D Model Fails to Converge

Post by Jirka » Fri Mar 27, 2020 2:53 pm

From your input I can see that you use either the Kosugi (Model=3) or Durner dual-porosity (Model=5) models. Durner model is obviously not based on the Kosugi's model, but on the van Genuchten-Mualem model. Thus, if you want to compare these two simulations, you need to use consistent models.

J.

hhfang
Posts: 7
Joined: Thu Mar 14, 2019 1:51 pm
Location: Germany

Re: HYDRUS 1D Model Fails to Converge

Post by hhfang » Fri Mar 27, 2020 5:20 pm

Thank you very much!

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