T2VOC

[mili]

I want to simulate a thermal flooding remediation concept on a coal tar contaminated site (14 thick aquifer, Ground water table at 4 m bgs). I conceptualized my model following the example problem Steam Displacement of NAPL in a 3-D Field Scale System in the PetraSim example manual.

I made a first run to get the steady-state condition, which I used then for a second run, which simulates the injection of naphthalene through 6 injection wells (napthalene enthalpy =1,47E4 for 10°C). On the right-side of the model I specified delivery wells. Then, I made a third run allowing the contaminant to spread for 10 years. I always experienced extremely long simulation times- for the last run I waited 4 hours for less than a year simulation time.

For the last run, instead of injection wells on the left side of the model I modeled 6 injection wells surrounding 1 extraction well in the middle. Injection wells rate= 1kg/s, enthalpy= 3,14E5 J/kg (for 75°C and p=2,37E5 Pa). The extraction well is a well on delivery with PI=2E-10m³ and p=2,37E5 Pa.

This run never converges. I tried changing the left and right-side boundary conditions, decreasing/increasing the time step, refining the grid,etc.

I even made several tries with the existing file t2VOC3d_part4, but using the new configuration. It does not converge, too.

For any suggestions I would be very thankful!

Milena

[Alison]

Dear Milena:

This is also a hard one to diagnose without seeing your files. You are welcome to send them to me, and I will take a look.

Best Regards,

Alison

alison@rockware.com