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## Error

• ### Re: Obtaining total mass from concentration

Thanks Peter! I will try that.
• ### Obtaining total mass from concentration

Hello all.
I modelled a BHE geothermal heat pump system and studied the impact of temperature on a contaminant. In my contaminant transport simulation, I put concentration of 100 mg/L in some nodes around a bhe and ran a heat and mass transport simulation (with biodegradation included) for 1 year. I wanted to know the initial mass correlated with initial 100 mg/L and final mass of contaminant after 1 year to see how much contaminant is degraded. I wonder how I could get total mass from concentration?
• ### Negative sorption coefficient?

Hello all,

I have modeled a contaminant transport from a spill in feflow and got some results. My first setup was implementing no sorption. In second simulation, I applied k=0.2 as Henry (linear) sorption coefficient and surprisingly the concentrations were higher than initial case with no sorption, which is opposite to the expectation.
I tried k=-0.2 and the results make sense, but I could not find a reference to this. Anyone know if we actually should put the sorption coefficient in negative?
• ### applying a certain amount of mass to nodal data as mass concentration

Hi everyone,
I want to model a volume of some contaminant as a spill. As I know, the only way is to apply it as mass concentration (in mg/L) into nodes. If I select all 6 nodes of a triangular prism element, which has 1000 L volume, and set the concentration to 1000 mg/L in every node, does it mean that I have modeled 1000 grams of mass in that area?
What would be the concentration in neighboring elements and nodes? Is concentration jumps from 1000 to zero from the selected node to other nodes around?