Search found 33 matches

by mGohar
Thu Apr 25, 2019 6:44 pm
Forum: HYDRUS (2D/3D)
Topic: Solute Boundary Condition Equations
Replies: 2
Views: 141

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: 141

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: 221

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: 221

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: 470

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: 470

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: 1540

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: 1540

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: 3164

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: 3164

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: 3164

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: 3022

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...
by mGohar
Thu Jul 28, 2016 2:09 am
Forum: HYDRUS (2D/3D)
Topic: Sign of Cumulative Zero/first order Reaction
Replies: 1
Views: 2887

Sign of Cumulative Zero/first order Reaction

Hi, I have a simple question about the sign of "Cumulative Zero/first order Reaction": I am modeling ammonium and nitrate transport, considering the nitrification by means of first-order solute decay chain. What I get for "Cumulative first order Reaction" of ammonium is positive concentration and fo...
by mGohar
Fri Jul 01, 2016 7:38 am
Forum: HYDRUS (2D/3D)
Topic: Possibility of using ParSWMS
Replies: 2
Views: 3416

Re: Possibility of using ParSWMS

Thanks for your reply Jirka.
by mGohar
Tue Jun 28, 2016 9:05 pm
Forum: HYDRUS (2D/3D)
Topic: Possibility of using ParSWMS
Replies: 2
Views: 3416

Possibility of using ParSWMS

Hi, I am interested in modeling water and solute transport (specifically Nitrogen considering the first-order decay chain reaction, all in the liquid phase, and also Phosphorus). I was wondering whether or not it is possible to benefit from the ParSWMS to accelerate simulation run time? and does usi...