ANSYS Fluent Tutorial | Analysis of Double Pipe Counterflow Heat Exchanger | ANSYS 19 R3 | Part 3/3
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- เผยแพร่เมื่อ 11 ม.ค. 2020
- It is an analysis of a Counterflow Heat exchanger to cool the engine oil for a large industrial gas turbine engine. The flow rate of cooling water through the outer annulus is 0.3 kg/s and the flow rate of engine oil through the inner tube is 0.01 kg/s. The water and oil enter the outer annulus and inner tube at temperatures of 293 K and 423K respectively. The wall thickness of the oil tube is 2 mm.
Part 1 : Geometry : • ANSYS Fluent Tutorial ...
Part 2 : Meshing : • ANSYS Fluent Tutorial ...
Part 3: Solver setup & Post Processing : • ANSYS Fluent Tutorial ... - วิทยาศาสตร์และเทคโนโลยี
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Great work sir. Thank you very much
You are most welcome 🙂🙂🙂.
Thank You sir, Great Tutorial
Most welcome. 🙂🙂🙂
Great work
Thank you
GOOD JOB MAN
Thank you
It is a nice tutorial.
Please can you do adiabatic capillary tube simulation?
will try to.
Thanks!
Most welcome.🙂🙂🙂
Thanks for the video. You are doing great job showing many different examples.
I m just wondering are you sure that you are using Turbulence model ? Although you selected turbulence model in the model section, we could not see see Turbulent intensity and turbulent viscosity ratio when you were specifying the inlet boundary conditions for both water and engine oil (4:17 in the video). Again, in the solution method, we can not see Turbulent Kinetic Energy and Turbulent Dissipation Rate discretizations.
I am extremely sorry , it's an editing issue, honestly speaking while making the tutorial, i had just skipped to record the boundary conditions and residual assigning parts. For that I again record the step but with a laminar model (mistakely) that's why it's not there in the video, but in the iteration page you can see the k & epsilon iterations plot, and results are also obtain according to the iterations. You can keep the default value of turbulent intensity & turbulent visocity. Thanks
I don't know if you can help me, but I have a similar problem but with a transient mass flow rate at one of the two inlets. When I calculate the problem as a steady problem with constant mass flow rates at both inlets the calculation converges. When I am calculating it as a transient problem with the transient mass flow rate, the calculation does not converge. Do you have a guess what the problem could be?
Transient problem convergence is different than the steady case, it converges in each time step and depends on the no of iterations in each time steps provided by you. It would iterate upto the time limit provided.
Great job with the tutorial. Do you think if we don't get up to 500 iterations, intead, do 200 or less, are we going to get the same results or a lil above 60 celcius? I did 120 iterations and I get 61 celcius.
Generally a higher number of iterations are recommended, as it gives a better results, though you might be getting outlet results same but the flow might not be stabilized. So you might not be getting a good contour.
@@AnsysTutor I Know what I did wrong, I did a mistake at the surface integral. I did no choose Facet Average to get the right temperatures. I did 20 iterations and the design works well to keep the temperature less than 60 celcius.
excellent, why "Wall-14" and "Wall - 15" created in my case? Could you explain little bit please. Thanks
This is because you have not removed the contact surfaces, if you had done the geometry make all the bodies into one part. This will prevent from creation of contact regions.
Sir thanks for your explanations
Just one question
When I wanna extract the data chart (Temperature 🌡️ vs length of pipe)
I want to tell
How can know the temperature 🌡️ improvement from the inlet to outlet?
You can create a polyline to get the chart.
Thanks A lot. Great Tutorial.
For me after running for 500 iterations I am getting outlet temp of water 297K and oil 389K. What would be the reason . I used all the same values which you did. Only difference is I am doing it in Ansys 15. Please update
Check the meshing, what is the no of elements and nodes ?
@@AnsysTutor Nodes: 60379, Elements: 187542
me too
When using k-epsilon model, the calculation results are similar to yours, and when using laminar model, the calculation results are similar to those in video.
hello again, how did you produced this inner_pipe_shadow ?
The shadow wall are generally produced by the solver if there is another cell zone next to the wall.
Can you share tutorials about external flow analysis ?
We have some tutorials on external flow , can you tell more about the external flow.
@@AnsysTutor for example, an aircraft center of pressure location, drag coefficient value, lift coefficient value etc. analysis if you can. Where flow is sperate ? Etc. I hope, i can explain what I wish. Thank you, if you don't do these
in model - why enhanced wall treatment? there is any reason?
If inflation layers are not present in meshing , it can be used for an approximate solution along the nearby wall regions.
@@AnsysTutor ohhhhhhhhh thank you!
In the question it is mentioned that wall thickness of oil tube in 2mm. But you assigned 2mm thickness to both "inner pipe wall" and "inner pipe wall shadow". Shouldn't you uncheck the shell conduction option for "inner pipe wall shadow"???
You can't uncheck the shadow shell conduction, it is just like the mirror of the "wall" what ever BCs you apply on the wall the same will be taken by the shadow wall automatically.
@@AnsysTutor OK. If you cant uncheck it, shouldn't you apply thickness of 1mm. 1mm of wall and 1mm of wall shadow equal to 2mm.
Thanks Sir
Sir plzz tell how to calculate temperature at outlet...I want to calculate an average value . Probe tool doesn't give proper result ...
you can get the facet average value at the outlet.
@@AnsysTutor in calculators option??
can we get exact value by using area avg option ??
At what temperatures are the properties of the engine oil entered.?
Please answer this
423 K, all mentioned in the problem statement.
Thanks for the reply. But wont the properties of the fluid like density, viscosity etc vary with temperature. In the video you have assigned it as constant. Can we use piecewise linear and enter our own data?
WARNING: Cannot allocate next Krylov vector, out of memory. Falling back to DQGMRES
I got This Error while Solving the same problem with same value which you took.
Update the mesh, reset the setup and Set up again, Check if the same problem arises again.