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Cyclic Boundary Condition
Posted Aug 21, 2011, 1:57 p.m. EDT 2 Replies
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Hi,
I have porous pipe flow with temp and velocity at inlet and pressure and heat outflow at exit.
I am doing a time dependent analysis and after say 30 min, I would like to reverse the boundary conditions.
This process needs to be done continuously until a quasi static state is reached. However I am only able to achieve this manually by changing the BC after every run.
Is is possible to automate this process? Any help is greatly appreciated.
Thanks.
Shriram R
I have porous pipe flow with temp and velocity at inlet and pressure and heat outflow at exit.
I am doing a time dependent analysis and after say 30 min, I would like to reverse the boundary conditions.
This process needs to be done continuously until a quasi static state is reached. However I am only able to achieve this manually by changing the BC after every run.
Is is possible to automate this process? Any help is greatly appreciated.
Thanks.
Shriram R
2 Replies Last Post Aug 24, 2011, 3:10 p.m. EDT
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Posted:
1 decade ago
Hi
have you tried to combine a parametric sweep with a transient, and use your "Parameter" to switch the BC's, you might need to fiddle the equations of the BC's or make you own "switchable" but I believe that should work nicely
--
Good luck
Ivar
have you tried to combine a parametric sweep with a transient, and use your "Parameter" to switch the BC's, you might need to fiddle the equations of the BC's or make you own "switchable" but I believe that should work nicely
--
Good luck
Ivar
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Posted:
1 decade ago
Hi Ivar,
Thank you very much for your input.
However I couldn't get it to work using parametric study, but I have been able to modify the matlab code and set up a loop to continuously change the boundary condition back and forth.
Now I just have 1 question. As you can see I am doing a time dependent analysis upto 1800 s.
But I want to use the last time step of solver 1 (sol1) as initial condition for solver 2 (sol2). However I can't see how the last time step of solver 1 at 1800 s can be specified, as from the code I am unable to see this.
Thank you.
Shriram
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model.sol('sol1').runAll;
model.sol('sol2').feature('st1').name('Compile Equations: Time Dependent 1');
model.sol('sol2').feature('st1').set('studystep', 'time1');
model.sol('sol2').feature('v1').set('control', 'time1');
model.sol('sol2').feature('v1').set('initmethod', 'sol');
model.sol('sol2').feature('v1').set('initsol', 'sol1');
model.sol('sol2').feature('t1').set('control', 'time1');
model.sol('sol2').feature('t1').set('tlist', '0 1 2 5 10 18 25 50 100 300 600 900 1200 1500 1800');
model.sol('sol2').feature('t1').set('maxorder', '2');
model.sol('sol2').feature('t1').feature('fc1').set('maxiter', '5');
model.sol('sol2').feature('t1').feature('fc1').set('jtech', 'once');
model.sol('sol2').runAll;
Thank you very much for your input.
However I couldn't get it to work using parametric study, but I have been able to modify the matlab code and set up a loop to continuously change the boundary condition back and forth.
Now I just have 1 question. As you can see I am doing a time dependent analysis upto 1800 s.
But I want to use the last time step of solver 1 (sol1) as initial condition for solver 2 (sol2). However I can't see how the last time step of solver 1 at 1800 s can be specified, as from the code I am unable to see this.
Thank you.
Shriram
.
.
.
.
.
model.sol('sol1').runAll;
model.sol('sol2').feature('st1').name('Compile Equations: Time Dependent 1');
model.sol('sol2').feature('st1').set('studystep', 'time1');
model.sol('sol2').feature('v1').set('control', 'time1');
model.sol('sol2').feature('v1').set('initmethod', 'sol');
model.sol('sol2').feature('v1').set('initsol', 'sol1');
model.sol('sol2').feature('t1').set('control', 'time1');
model.sol('sol2').feature('t1').set('tlist', '0 1 2 5 10 18 25 50 100 300 600 900 1200 1500 1800');
model.sol('sol2').feature('t1').set('maxorder', '2');
model.sol('sol2').feature('t1').feature('fc1').set('maxiter', '5');
model.sol('sol2').feature('t1').feature('fc1').set('jtech', 'once');
model.sol('sol2').runAll;