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Step 1 results as initial values for step 2?
Posted Feb 10, 2012, 4:25 a.m. EST 3 Replies
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I have the following problem:
A study with two time dependent steps:
step 1: the hydrostatic Navier-Stokes equation is solved for pressure variable p0
step 2: the full Navier-Stokes equation is solved for variables u,v,w,p. How do I initialize the pressure field p with p0?
i.e. I have defined two distinct equations in variables p0 and u,v,w,p respectively.
If I try the following for 'Dependent Variables 2' of step 2, COMSOL still calculates its own (incorrect) initial values at the beginning of step 2.
img40.imageshack.us/img40/5387/dependentvariables.png
Btw, 'Step 1 saved' solution is a save solution object that stores the solution of step 1. In the 'Initial values' object of the full NS equation, I have put p=p0 as initial value.
Any help would be greatly appreciated!
A study with two time dependent steps:
step 1: the hydrostatic Navier-Stokes equation is solved for pressure variable p0
step 2: the full Navier-Stokes equation is solved for variables u,v,w,p. How do I initialize the pressure field p with p0?
i.e. I have defined two distinct equations in variables p0 and u,v,w,p respectively.
If I try the following for 'Dependent Variables 2' of step 2, COMSOL still calculates its own (incorrect) initial values at the beginning of step 2.
img40.imageshack.us/img40/5387/dependentvariables.png
Btw, 'Step 1 saved' solution is a save solution object that stores the solution of step 1. In the 'Initial values' object of the full NS equation, I have put p=p0 as initial value.
Any help would be greatly appreciated!
3 Replies Last Post Jul 3, 2014, 4:28 a.m. EDT
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Posted:
1 decade ago
I have the following problem:
A study with two time dependent steps:
step 1: the hydrostatic Navier-Stokes equation is solved for pressure variable p0
step 2: the full Navier-Stokes equation is solved for variables u,v,w,p. How do I initialize the pressure field p with p0?
i.e. I have defined two distinct equations in variables p0 and u,v,w,p respectively.
If I try the following for 'Dependent Variables 2' of step 2, COMSOL still calculates its own (incorrect) initial values at the beginning of step 2.
img40.imageshack.us/img40/5387/dependentvariables.png
Btw, 'Step 1 saved' solution is a save solution object that stores the solution of step 1. In the 'Initial values' object of the full NS equation, I have put p=p0 as initial value.
Any help would be greatly appreciated!
solve step :! . Then,
go to solvers, right click and select solution ---> copy
Use step 2 and say initial values from "copy2" whatever you have named ... from initial values node you can do this .. !
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Posted:
1 decade ago
Thanks for your suggestion, it works.
Since I want to use this in a parametric sweep, I'd guess that I will probably be best off by implementing this in a comsol/matlab script.
Since I want to use this in a parametric sweep, I'd guess that I will probably be best off by implementing this in a comsol/matlab script.
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Posted:
1 decade ago
I have the same problem, but I don't understand this answer.
Anyone could explain it in more details?
Anyone could explain it in more details?