Hello all, I am having an issue with current conservation using the AC/DC module and a stationary 3D model.
The model is two parallel pieces of copper and a small piece of aluminum between them. I add either a voltage or current source at the end of one piece of copper and a ground or current sink at the end of the other. Basically I am making current from through one piece of copper, through the aluminum block and out the other copper piece.
I have been setting the normal current density source at the ends such that exactly 100000 amps (arbitrary) runs into and out the ends of the copper. I then solve the system and do a surface integral of the normalized current density at the interface between the copper and aluminum pieces. I get a total current of over 100000 amps, Something 1.5 times as much. If I do a cut plane in the middle of the aluminum piece however and integrate over the current density there I get something like 99999 amps (good enough since its a numerical solver). I tried cranking up my mesh at the boundries of the aluminum and copper interface but it is still the same.
According to Kirchhoff I should be getting 100000 amps at any slice through my model. There is no way I can have 150000 amps running through anywhere in the system if all I input is 100000. Or if I do a voltage source at the end of the pieces I should get the same integrated current through any slice of the model.
Any ideas? Thanks
The model is two parallel pieces of copper and a small piece of aluminum between them. I add either a voltage or current source at the end of one piece of copper and a ground or current sink at the end of the other. Basically I am making current from through one piece of copper, through the aluminum block and out the other copper piece.
I have been setting the normal current density source at the ends such that exactly 100000 amps (arbitrary) runs into and out the ends of the copper. I then solve the system and do a surface integral of the normalized current density at the interface between the copper and aluminum pieces. I get a total current of over 100000 amps, Something 1.5 times as much. If I do a cut plane in the middle of the aluminum piece however and integrate over the current density there I get something like 99999 amps (good enough since its a numerical solver). I tried cranking up my mesh at the boundries of the aluminum and copper interface but it is still the same.
According to Kirchhoff I should be getting 100000 amps at any slice through my model. There is no way I can have 150000 amps running through anywhere in the system if all I input is 100000. Or if I do a voltage source at the end of the pieces I should get the same integrated current through any slice of the model.
Any ideas? Thanks