Jump to content
GMS, SMS, and WMS User Forum
woodward

Dispersion coefficient in FEMWATER

Recommended Posts

I am running a contaminant transport model in FEMWATER.

I am wondering if I have set up the dispersion coefficient parameters correctly.

In the FEMWATER manual it gives the equation for the D tensor as

theta D = aT |V| delta + (aL-aT) V^2 / |V| + am theta tau delta

where

theta is the moisture content (not the porosity)

delta is the Kronecker delta function (basically an identity matrix)

am * tau is the molecular diffusivity D*

V is the fluid velocity

aL is the longitudianl dispersivity

aT is the transverse dispersivity

My problem is the first theta. In all the other references I have seen it is not there, for example Zheng & Bennett 2002. I am wondering if it is a typo. If it is not a typo then the parameters in this equation are different the usual form such as given in Zheng & Bennett and it would make a big difference.

Would appreciate your help. Thanks.

Edit: Update: Actually V in the above equation is the Darcy velocity = theta * Fluid (seepage) velocity. So theta appears in every term. It seems this equation is the correct form for unsaturated conditions. My mistake.

Edited by woodward
  • Like 1

Share this post


Link to post
Share on other sites

Edit: Deleted.

Edited by woodward
  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...