Domain expert please help
 

hi i'm having the following problem:

i simulating flow (groundwater) through different regions (Qty 3) of permeability and tried the following:

1. single mesh with 3 different sub domains each with different permeability 2. single mesh with 3 different domains each with different permeability 3. 3 separate mesh of the different permeability linked with interfaces

which should be the best configuration? methods 1 and 2 yield results that are relatively similiar 2% difference methods 3 yield results that are vastly different..almost 85% difference

i'm interested in the pressure at my inlet so measure results are from there.

thanks

Re: Domain expert please help
 

are they the same size meshes? or have you got a mesh independance problem?

Re: Domain expert please help
 

no mesh problems. i basically took a large mesh and sectioned it into equal parts so fitting is okie.

Re: Domain expert please help
 

can yo utell where the problem is going wrong? i.e. is it at the interfaces? or during one particular domain etc. can you make a slice that would show where the differences start to occur and help you decide where your problem is?