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OpenGeoSys THM/C simulator version 5
https://www.opengeosys.org/ogs-5
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a question about the file "CONSTANT_NEUMANN 0.0002" #144

Open zhangguangwu opened 5 years ago

zhangguangwu commented 5 years ago

Description

GeoSys-ST: Source Terms ------------------------------------------------

SOURCE_TERM

$PCS_TYPE GROUNDWATER_FLOW $PRIMARY_VARIABLE HEAD $GEO_TYPE POLYLINE Channel $DIS_TYPE
CONSTANT -20

STOP

$DIS_TYPE
CONSTANT_NEUMANN 0.0002

Steps to Reproduce the Problem

1. 2.

Expected behavior: I don't know the mean of 'CONSTANT_NEUMANN 0.0002',Can you tell me the physics meanof this file? Actual behavior:** normal

Specifications

norihiro-w commented 5 years ago

GSRF-manual.pdf please take a look at the attached manual. Indeed the doc is for old version of OGS (ver.4), but most of keywords are still valid in vers 5.

Physical meaning of the CONSTANT_NEUMANN depends on process type. For GROUNDWATER_FLOW process, I guess the parameter value means the incoming or outgoing fluid velocity (Darcy velocity). Its conversion to the volumetric flux is automatically handled in ogs.

zhangguangwu commented 5 years ago

Thank Mr Norihiro Watanabe very much. I will read this manual well.

At 2019-06-05 07:22:08, "Norihiro Watanabe" notifications@github.com wrote:

GSRF-manual.pdf please take a look at the attached manual. Indeed the doc is for old version of OGS (ver.4), but most of keywords are still valid in vers 5.

Physical meaning of the CONSTANT_NEUMANN depends on process type. For GROUNDWATER_FLOW process, I guess the parameter value means the incoming or outgoing fluid velocity (Darcy velocity). Its conversion to the volumetric flux is automatically handled in ogs.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

zhangguangwu commented 5 years ago

Hello,Mr Lars Bilke. I have read the chapter of the GSRF- manual about source term. I'm a little confused about this sentence" CONSTANT NEUMANN meaning ： value times node area/node length is assigned to each node found ". How do I understand this sentence?

for example：in the OpenGeoSys - TutorialComputational Hydrology I:Groundwater Flow Modelling Chapter 4 Benchmark: Theis problem theis problem in 2D or 3D, the constant neumann was applied in point . but How to understand this matter when applied in polyline? foer example : the benchmark q_quad shows source term file:

Can I understand it as the total outgoing fluid(Q) divided by the length of "polyline: channel"? Looking forward to your reply.

At 2019-06-05 07:22:08, "Norihiro Watanabe" notifications@github.com wrote:

GSRF-manual.pdf please take a look at the attached manual. Indeed the doc is for old version of OGS (ver.4), but most of keywords are still valid in vers 5.

Physical meaning of the CONSTANT_NEUMANN depends on process type. For GROUNDWATER_FLOW process, I guess the parameter value means the incoming or outgoing fluid velocity (Darcy velocity). Its conversion to the volumetric flux is automatically handled in ogs.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

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