Search found 36 matches

by mGohar
Sat Oct 26, 2019 12:26 am
Forum: HYDRUS (2D/3D)
Topic: Handling water balance error in wet conditions
Replies: 4
Views: 73

Re: Handling water balance error in wet conditions

Thanks for your reply Jirka, I forgot to mention that the problem is an axisymmetrical domain and water is added in every two hours with a constant flux value (for duration of ~3 min) for the entire simulation time. My first though was maybe Hydrus decreases the convergence tolerance which (I guess...
by mGohar
Thu Oct 24, 2019 8:31 pm
Forum: HYDRUS (2D/3D)
Topic: Handling water balance error in wet conditions
Replies: 4
Views: 73

Re: Handling water balance error in wet conditions

Thanks for your reply Jirka, I forgot to mention that the problem is an axisymmetrical domain and water is added in every two hours with a constant flux value (for duration of ~3 min) for the entire simulation time. My first though was maybe Hydrus decreases the convergence tolerance which (I guess)...
by mGohar
Thu Oct 24, 2019 1:31 am
Forum: HYDRUS (2D/3D)
Topic: Handling water balance error in wet conditions
Replies: 4
Views: 73

Handling water balance error in wet conditions

Hi,

I noticed that when my domain gets close to the wet condition, Hydrus seems to trigger something which results in improving the water balance error. My question is if that's true, what Hydrus does change and what condition triggers this?

WBE_T.png
WBE_T.png (19.54 KiB) Viewed 73 times

Thanks
by mGohar
Thu Apr 25, 2019 6:44 pm
Forum: HYDRUS (2D/3D)
Topic: Solute Boundary Condition Equations
Replies: 2
Views: 297

Re: Solute Boundary Condition Equations

Thanks for your reply!
by mGohar
Tue Apr 23, 2019 11:01 pm
Forum: HYDRUS (2D/3D)
Topic: Solute Boundary Condition Equations
Replies: 2
Views: 297

Solute Boundary Condition Equations

Hi,

My quick question is what is 'c_n' in equations 6.35, 6.36, and 6.38 in the technical manual? Is it the nodal concentration in the current time or the one in the previous time step?

Thanks
by mGohar
Fri Mar 01, 2019 1:04 am
Forum: Hydrus 1D
Topic: Question about when the "vTop" is calculated
Replies: 2
Views: 360

Re: Question about when the "vTop" is calculated

Oh I see, thanks so much for the reply.
by mGohar
Thu Feb 28, 2019 7:16 pm
Forum: Hydrus 1D
Topic: Question about when the "vTop" is calculated
Replies: 2
Views: 360

Question about when the "vTop" is calculated

Hi,

By looking at the Hydrus 1D code, is this true that the "vTop" (actual surface flux) is calculated before the final iteration of the water flow equation? If this is the case why not (re)calculate it after solving for the head values?

Thanks,
Mohammad
by mGohar
Wed May 23, 2018 8:57 pm
Forum: HYDRUS (2D/3D)
Topic: Number of Working CPUs in a Run
Replies: 2
Views: 592

Re: Number of Working CPUs in a Run

Thanks so much for the information.
by mGohar
Tue May 22, 2018 7:07 pm
Forum: HYDRUS (2D/3D)
Topic: Number of Working CPUs in a Run
Replies: 2
Views: 592

Number of Working CPUs in a Run

Hi,

My question is: how can I figure out the number of employed CPU cores by Hydrus(Hypar) in a simulation? Is is recorded somewhere?


Thanks.
by mGohar
Tue Aug 08, 2017 6:53 pm
Forum: HYDRUS (2D/3D)
Topic: Recommended Iteration Criteria when having solute transport
Replies: 2
Views: 1698

Re: Recommended Iteration Criteria when having solute transp

The recommended value for Relative tolerance concentration as recommended in the manual is '0.001'. In the case when there are multiple solutes, as I re-read the help, the solution is to specify (very) small value for Absolute T.C. and let the Relative one do the job since the final tolerance is eva...
by mGohar
Wed Aug 02, 2017 7:32 pm
Forum: HYDRUS (2D/3D)
Topic: Recommended Iteration Criteria when having solute transport
Replies: 2
Views: 1698

Recommended Iteration Criteria when having solute transport

Hi, My question: when I have three different solutes to model (with different concentrations) and two of them have nonlinear adsorption parameters, what would be the recommended Iteration Criteria, i.e. Absolute Con. Tol. (and Relative Con. Tol.)? And does it have something to do with maximum time s...
by mGohar
Wed Mar 29, 2017 11:29 pm
Forum: HYDRUS (2D/3D)
Topic: One specific solute spicies balance error
Replies: 5
Views: 3390

Re: One specific solute spicies balance error

Jirka wrote:Have you seriously posted a 430Mb zip file? That will take me some time to look at. J.
Why not? It took only less than a minute ;)

Thanks Jirka
by mGohar
Fri Mar 24, 2017 10:31 pm
Forum: HYDRUS (2D/3D)
Topic: One specific solute spicies balance error
Replies: 5
Views: 3390

Re: One specific solute spicies balance error

Hi Jirka,

I have posted the project file to you in pm. Could you please then take a look at that?

Thanks,
Mohammad
by mGohar
Fri Mar 17, 2017 9:02 pm
Forum: HYDRUS (2D/3D)
Topic: One specific solute spicies balance error
Replies: 5
Views: 3390

One specific solute spicies balance error

Hi, I am simulating water, ammonium, nitrate, and phosphorus transport in a container with drip irrigation while there is evapotranspiration and root uptake and the soil is coarse. The mesh size for the top boundary where there is evaporation is 0.5 cm and there is no root uptake at this layer. Here...
by mGohar
Mon Nov 21, 2016 10:18 am
Forum: HYDRUS (2D/3D)
Topic: Reason for difference in simulation time for two soils
Replies: 1
Views: 3140

Reason for difference in simulation time for two soils

Hi, I'm just curious why there is a huge difference in simulation time between two soils I'm concerning. Here I'm considering just water flow in a 3D domain with drip irrigation and about 360,000 3D-Elements. For the first soil it runs really fast but in the second one it takes more than 15 times lo...