temporal boundary conditions heat transport

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1

Dear OGS users

I am wondering how to model heat plumes originating from groundwater pumps (e.g. reinjection of warm water back to the ground water). By assigning a boundary condition for the temperature at the reinjection node (dirichlet BC) within a rfd file, the temperature can be set (at all times). If the groundwater pump is only used once in a while (e.g 2 hours per day and the temporal source term is defined in a rfd file), there ist still heat orginating from the reinjection node if the pump is not reinjecting water, as there ist still a regional ground water flow, that passes the reinjection node. Is there a way to temporarily switch off the temparature boundary condition at the reinjection node (that is by temporarily not defining a certain temperature in the boundary condition)?

Thanks for some hints,

Paul

2

Dear Paul,

You can use the subkeyword “$TIME_CONTROLLED_ACTIVE” in boundary condition. For example

#BOUNDARY_CONDITION

$PCS_TYPE

HEAT_TRANSPORT

$PRIMARY_VARIABLE

TEMPERATURE1

$GEO_TYPE

POLYLINE PLY_1

$DIS_TYPE

CONSTANT 10

$TIME_CONTROLLED_ACTIVE

1

;this is the curve number in .rfd file, time vs value

;during the calculation, if the value is 0, this BC will be switched off, if the value is positive, this BC will be switch on.

For example in .rfd file

#CURVES ;CURVE 1, TIME vs value

0 0

1 0

1.9 0

2 1

4 1

4.1 0

24 0

It means the BC is switched on only by time 2-4.

Best regards

Wenjie

···

发件人: ogs-users@googlegroups.com [mailto:ogs-users@googlegroups.com] 代表 pmborer@gmail.com
发送时间: 2016年12月21日 23:51
收件人: ogs-users
主题: [ogs-users] temporal boundary conditions heat transport

Dear OGS users

I am wondering how to model heat plumes originating from groundwater pumps (e.g. reinjection of warm water back to the ground water). By assigning a boundary condition for the temperature at the reinjection node (dirichlet BC) within a rfd file, the temperature can be set (at all times). If the groundwater pump is only used once in a while (e.g 2 hours per day and the temporal source term is defined in a rfd file), there ist still heat orginating from the reinjection node if the pump is not reinjecting water, as there ist still a regional ground water flow, that passes the reinjection node. Is there a way to temporarily switch off the temparature boundary condition at the reinjection node (that is by temporarily not defining a certain temperature in the boundary condition)?

Thanks for some hints,

Paul

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3

Thanks Wenjie

That worked perfectly fine!

Best regards,

Paul

···

Am Mittwoch, 21. Dezember 2016 16:51:12 UTC+1 schrieb pmb...@gmail.com:

Dear OGS users

I am wondering how to model heat plumes originating from groundwater pumps (e.g. reinjection of warm water back to the ground water). By assigning a boundary condition for the temperature at the reinjection node (dirichlet BC) within a rfd file, the temperature can be set (at all times). If the groundwater pump is only used once in a while (e.g 2 hours per day and the temporal source term is defined in a rfd file), there ist still heat orginating from the reinjection node if the pump is not reinjecting water, as there ist still a regional ground water flow, that passes the reinjection node. Is there a way to temporarily switch off the temparature boundary condition at the reinjection node (that is by temporarily not defining a certain temperature in the boundary condition)?

Thanks for some hints,

Paul