coefficient as a function of position

[Xi Tan]

Hi,

I tried to define coefficients such as rate constant as a function of position x. I found that in Auxkernels/Position.C, the position is defined as (*_current_node)(0)/_r_units or _q_point[_qp](0)/_r_units. But in Gas.C I cannot use _current_node since it is not available in material.h. Could anyone help me to figure this out? How can I obtain the value of position x in Gas.C? 

Many Thanks!

Xi

[Casey Icenhour]

Hi Xi,

While the Material class doesn't seem to have access to _current_node, it does have _q_point. So to obtain position x you would use _q_point[_qp](0) (or _q_point[_qp](0) / _r_units if you were scaling your units). Since you stated this form in your original message, does _q_point[_qp](0) not work for you?

FYI the MOOSE Material class source code is documented in the MOOSE doxygen: http://www.mooseframework.org/docs/doxygen/moose/classMaterial.html

Best,

Casey

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[Xi Tan]

Hi, Casey,

I now understand more about MOOSE Material class, and I tried just using  _q_point[_qp](0) / _r_units and it works, thank you so much for your help!

Best,

Xi