[Guille1811]

Im running a transient and i need to monitor the max temperature value on the imaginary finite line defined by the points (0,1,0) and (0,1,150). I don´t know how to do this since the line is not a physical entity and doesn´t belong to any location compatible with cfxpre monitor setup.

Any help?

[ghorrocks]

This is easy in post processing, but I assume you want to do it in the solver. Can you put a series of monitor points along the line and export it and get the maximum from there? It is a bit of a hack but easy to implement.

[Gert-Jan]

You can create a lot of monitoring points on this line and monitor the temperature on each point. A monitorplot in the solver manager will show you which monitor point has the highest temperature.

Alternatively you can create a plane (thin strip) in your geometry and mesh it as an interface. Then this interface appears as mesh locator in CFX-Pre which can be used in monitoring the maximum temperature.

[Guille1811]

Originally Posted by ghorrocks

This is easy in post processing, but I assume you want to do it in the solver. Can you put a series of monitor points along the line and export it and get the maximum from there? It is a bit of a hack but easy to implement.

I was rhinking to do somthing like that, but i need it to make it work in a bit more elegant way. Im thinking of th following:

Create a temperature monitor every 5 mts (so it would be 30 monitors) and also create a variable/expression that takes the value of the maximum value of all the monitors. In other words, something like: maxtemp= maxVal(all the monitors), so the value of the expression would be the max temp every timestep and i then i can simply monitor that expression and problem solved.

Can this be done? Particularly setting a CEL for pcking the max value in a set of variables/expressions...

[Guille1811]

so the value of the expression would be the max temp every timestep

or alternatively the max temp of the PREVIOUS timestep, if that is any easier to implement

[Gert-Jan]

Monitor points are not mesh locators. So you cannot use them in expressions like maxVal

[Guille1811]

Originally Posted by Gert-Jan

Monitor points are not mesh locators. So you cannot use them in expressions like maxVal

Yes indeed, i was not suggesting to use that specific function as the solution, it was just to make my intention clear. Sorry if i expressed myself badly.

[Gert-Jan]

Your intention is completely clear.
It is just that it is not possible to use Monitoring points in any equation or CEL expression since these points are not mesh locators. So, there is no solution, other than what I wrote in my previous reply.

[Guille1811]

Originally Posted by Gert-Jan

Your intention is completely clear.
It is just that it is not possible to use Monitoring points in any equation or CEL expression since these points are not mesh locators. So, there is no solution, other than what I wrote in my previous reply.

Thanks for the response.

What if a create a probe for every temperature monitor? Something like:

Monitor 10 mts: temperature at (0,1,10)
temp at 10 mts: expression defined as probe(Temperature)@Monitor 10 mts

Then i could find the max value among all those expressions, can this be done?

Despite, is there a CEL command to find the max value among a set of expressions (or a set of anything is thats the case) ?

[Gert-Jan]

In CFX-Pre, you should go to Definition window of the expression section, and press your right mouse button, you will see that there are numerous options. By selecting Funtions>CEL you will see that there is max-function, and many more.

So, yes you can use a function like max(T1,T2) which will give you the maximum of T1 and T2. And T1 and T2 can be something like T1=maxVal(T)@outlet and T2=maxVal(T)@Wall, since Wall and outlet are meshlocators.
But T1 nor T2 can be related to a monitoring Point because they aren't meshlocators.

[Guille1811]

Thanks for the tip but sadly that function only accepts 2 expressions as input and i would need to obtain the max between like 30 expressions...

[Gert-Jan]

So, you have to use the max-function 30 times to determine the maximum. This is still doable. Go to Expressions, and use your right mouse button to edit the expressions in Command Editor, so you can copy paste the expressions and modify them as in a text editor.

I consider this as a bit silly and think it is easier to create a mesh on a small strip (as an interface) along the line of interest and monitor the maximum on this strip: maxVal(Temperature)@interface

[Guille1811]

I guess i will do the first option. Thanks for the help.

One more question: should the total run time increase a lot because of all the 30+ expressions defined?

[ghorrocks]

No, 30 simple expressions should not affect run time. But don't take my word for it, do a run with and without the expressions and see for yourself.