Hi All,
I discussed before regarding the hydrostatic equilibrium condition for H2 case. I would like to thank Nori and Wang.
Now I have a situation. I am checking mechanical equilibrium condition and hydrostatic equilibrium condition for H2M case considering CAM_CLAY. Soil column height is 1 m and width 0.1 m. Gravity activated for both Liquid (Density =1000 ) and Solid (Density = 2000) mass. The mechanical equilibrium is working fine, and logical. But, for Hydrostatic condition, in H2 phase, Liquid pressure is triangular and logical. To achieve it, I used
#INITIAL_CONDITION
$PCS_TYPE
MULTI_PHASE_FLOW
$PRIMARY_VARIABLE
PRESSURE1
$GEO_TYPE
DOMAIN
$DIS_TYPE
CONSTANT 0
#INITIAL_CONDITION
$PCS_TYPE
MULTI_PHASE_FLOW
$PRIMARY_VARIABLE
PRESSURE2
$GEO_TYPE
DOMAIN
$DIS_TYPE
GRADIENT 1 0 9810
Now for DEFORMATION, I used as follows
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
STRESS_YY
$GEO_TYPE
DOMAIN
$DIS_TYPE
GRADIENT 1 0 19620
At time step zero, STRESS_YY is showing zero, and GRADIENT is not working. But, I need STRESS_YY=Densitygy=20009.81y, at top it need to be zero and bottom 19620. Any idea how to resolve it?
Regards,
Mohammad
Hi,
I think you need to change $PRIMARY_VARIABLE to DISPLACEMENT_Y (or Y1, not sure).
n
···
On 06/15/2017 05:37 AM, Mohammad Islam wrote:
Hi All,
I discussed before regarding the hydrostatic equilibrium condition for H2 case. I would like to thank Nori and Wang.
Now I have a situation. I am checking mechanical equilibrium condition and hydrostatic equilibrium condition for H2M case considering CAM_CLAY. Soil column height is 1 m and width 0.1 m. Gravity activated for both Liquid (Density =1000 ) and Solid (Density = 2000) mass. The mechanical equilibrium is working fine, and logical. But, for Hydrostatic condition, in H2 phase, Liquid pressure is triangular and logical. To achieve it, I used
#INITIAL_CONDITION
$PCS_TYPE
MULTI_PHASE_FLOW
$PRIMARY_VARIABLE
PRESSURE1
$GEO_TYPE
DOMAIN
$DIS_TYPE
CONSTANT 0
#INITIAL_CONDITION
$PCS_TYPE
MULTI_PHASE_FLOW
$PRIMARY_VARIABLE
PRESSURE2
$GEO_TYPE
DOMAIN
$DIS_TYPE
GRADIENT 1 0 9810
Now for DEFORMATION, I used as follows
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
STRESS_YY
$GEO_TYPE
DOMAIN
$DIS_TYPE
GRADIENT 1 0 19620
At time step zero, STRESS_YY is showing zero, and GRADIENT is not working. But, I need STRESS_YY=Density*g*y=2000*9.81*y, at top it need to be zero and bottom 19620. Any idea how to resolve it?
Regards,
Mohammad
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Dear Nori,
In Hydrostatic condition, at time=0, Displacements in X, Y, Z directions are zero and OGS results also agree with it. If I use following command, it will provide Displacement gradient along Y-direction. But, I need Vertical Stress gradient due to Gravity force ( Y=1, STRESS_YY=0; Y=0,STRESS_YY=Densityg(1-Y)=19620 )
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
DISPLACEMENT_Y
$GEO_TYPE
DOMAIN
$DIS_TYPE
GRADIENT 1 0 19620
I looks GRADIENT command is working fine for H2 case, but some how it is not working for me in Mechanical case, like for DISPLACEMENT_Y or STRESS_YY. Any idea?
Regards,
Mohammad
Regards,
Mohammad
···
On Wednesday, 14 June 2017 17:23:48 UTC-4, Norihiro Watanabe wrote:
Hi,
I think you need to change $PRIMARY_VARIABLE to DISPLACEMENT_Y (or Y1,
not sure).
n
okay.. I thought one should use DISPLACEMENT_Y for stress yy. maybe I'm confused with something else.
how about the following setting?
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
STRESS_YY
$GEO_TYPE
SUB_DOMAIN
1
0 0+19620*y
···
On 06/15/2017 07:01 AM, Mohammad Islam wrote:
Dear Nori,
In Hydrostatic condition, at time=0, Displacements in X, Y, Z directions are zero and OGS results also agree with it. If I use following command, it will provide Displacement gradient along Y-direction. But, I need Vertical Stress gradient due to Gravity force ( Y=1, STRESS_YY=0; Y=0,STRESS_YY=Density*g*(1-Y)=19620 )
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
DISPLACEMENT_Y
$GEO_TYPE
DOMAIN
$DIS_TYPE
GRADIENT 1 0 19620
I looks GRADIENT command is working fine for H2 case, but some how it is not working for me in Mechanical case, like for DISPLACEMENT_Y or STRESS_YY. Any idea?
Regards,
Mohammad
Regards,
Mohammad
On Wednesday, 14 June 2017 17:23:48 UTC-4, Norihiro Watanabe wrote:
Hi,
I think you need to change $PRIMARY_VARIABLE to DISPLACEMENT_Y (or Y1,
not sure).
n
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Dear Nori,
Now it shows some results! Good sign.
But, in bottom 9.475386710584e+001 and top 1.961106694675e+004, while I need at bottom 19620, top 0.Somehow I need to reverse the result.
Regards,
Mohammad
···
On Wednesday, 14 June 2017 18:07:12 UTC-4, Norihiro Watanabe wrote:
okay… I thought one should use DISPLACEMENT_Y for stress yy. maybe I’m
confused with something else.
how about the following setting?
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
STRESS_YY
$GEO_TYPE
SUB_DOMAIN
1
0 0+19620*y
On 06/15/2017 07:01 AM, Mohammad Islam wrote:
Dear Nori,
In Hydrostatic condition, at time=0, Displacements in X, Y, Z
directions are zero and OGS results also agree with it. If I use
following command, it will provide Displacement gradient along
Y-direction. But, I need Vertical Stress gradient due to Gravity force (
Y=1, STRESS_YY=0; Y=0,STRESS_YY=Densityg(1-Y)=19620 )
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
DISPLACEMENT_Y
$GEO_TYPE
DOMAIN
$DIS_TYPE
GRADIENT 1 0 19620
I looks GRADIENT command is working fine for H2 case, but some how it is
not working for me in Mechanical case, like for DISPLACEMENT_Y or
STRESS_YY. Any idea?
Regards,
Mohammad
Regards,
Mohammad
On Wednesday, 14 June 2017 17:23:48 UTC-4, Norihiro Watanabe wrote:
Hi,
I think you need to change $PRIMARY_VARIABLE to DISPLACEMENT_Y (or Y1,
not sure).
n
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After using following, bottom 1.952524613289e+004 & top 8.933053249650e+000. I wish I could dig out the source of the 8.93 !!
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
STRESS_YY
$GEO_TYPE
SUB_DOMAIN
1
0 19620±19620*y
If the value is at a mesh node, 8.93 is probably a result of extrapolation. In OGS, stress used for calculation is stored at Gauss integration points (inside of elements). For output purposes, they are extrapolated to nodal values.
n
···
On 06/15/2017 12:17 PM, Mohammad Islam wrote:
After using following, bottom 1.952524613289e+004 & top 8.933053249650e+000. I wish I could dig out the source of the 8.93 !!
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
STRESS_YY
$GEO_TYPE
SUB_DOMAIN
1
0 19620+-19620*y
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but please also check if the node coordinate is exactly zero at top.
···
On 06/15/2017 01:01 PM, Norihiro Watanabe wrote:
If the value is at a mesh node, 8.93 is probably a result of extrapolation. In OGS, stress used for calculation is stored at Gauss integration points (inside of elements). For output purposes, they are extrapolated to nodal values.
n
On 06/15/2017 12:17 PM, Mohammad Islam wrote:
After using following, bottom 1.952524613289e+004 & top 8.933053249650e+000. I wish I could dig out the source of the 8.93 !!
#INITIAL_CONDITION
$PCS_TYPE
DEFORMATION
$PRIMARY_VARIABLE
STRESS_YY
$GEO_TYPE
SUB_DOMAIN
1
0 19620+-19620*y
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