November 12, 2019 at 4:24 pmJackelySubscriber
I'm trying to create a simple model of the mold temperature control.
as you can see in the picture are Cooling/heating channels.
i have watched this video until a point in time 1: 2 min
My question (to be sure that I am on the right way).
I should create three different bodies ( tool and 2 channels ) (if yes, how can I do that? )
November 12, 2019 at 10:21 pm
November 13, 2019 at 1:55 ampeteroznewmanSubscriber
Please show what is in your Workbench project schematic. Did you have a Fluent analysis system? Is that where you created Geometry and then Mesh?
November 13, 2019 at 8:37 amJackelySubscriber
November 13, 2019 at 12:02 pmRobAnsys Employee
You've not got a mesh: do you have volumes or faces in geometry?
November 13, 2019 at 2:41 pmJackelySubscriber
I created the volumes in geometry.
is this the right analysis system for my case? or should I analyze that in thermal-stationary system.
November 13, 2019 at 4:31 pmRobAnsys Employee
What are you trying to find out? Please show the tree in Meshing (expand the Geometry section).
November 13, 2019 at 7:56 pm
November 14, 2019 at 11:54 amRobAnsys Employee
As it's filling, changing, being cooled? Is the coolant flow important or can you assume it's all solid?
November 15, 2019 at 11:40 amJackelySubscriber
the coolant flow is unimportant for me, I only have to see or simulate the temperature curve in the tool.
I have to enter the inlet temperature of water.
The idea is that the temperature control tool causes a cooling error. (see pictures)
Cooling error is the difference between qmax and qmin.
and this is what I wanted to do with this example
November 15, 2019 at 12:00 pmRobAnsys Employee
Is the material that's being cooled liquid or solid at the point you're interested? Does it move?
November 15, 2019 at 12:11 pmJackelySubscriber
Tool is made of steel
and water flows into and out of these round canals (and is always considered liquid).
November 15, 2019 at 1:59 pmpeteroznewmanSubscriber
You could build a series of models to develop some skills with ANSYS and grow your understanding of this problem, which can become very complex.
Though the real problem is transient, start working with a steady state solution to see what that shows.
Start with a 2D model and ignore the temperature change of the cooling fluid as it travels through the depth of the tool. That means drawing a section of the tool on the XY plane as a surface.
For either 2D or 3D, you have to set boundary conditions on all surfaces of the tool, which in 2D are edges. A simple model could have the temperature on the side of the tool that the molten plastic is flowing past is set as a constant value, while the edges where the coolant is flowing could have the temperature of the coolant. That leaves the other 3 edges, which could have convection with the outside air temperature. Or you could make just one outside edge have convection to outside air while the two sides of the tool have symmetry. This represents a small section of a much longer tool.
Once you have success at a 2D steady state model, you can try more complicated models. The most complex model could have molten plastic advancing into the cavity and freezing onto the walls as it goes.
November 16, 2019 at 2:14 pmJackelySubscriber
Thank you very much for your answer.
this is really a useful suggestion.
I also have the experimental results that have already been done by someone else, but so far I have no access to these results.
and I think it makes sense for me to concentrate totally on simulation.
I'll be back when there's anything new.
November 23, 2019 at 4:56 pmJackelySubscriber
Hello all dear members of the Ansys Forum;
I have done the model in Steady State Thermal Analysis.
these were my steps:
1. I considered or simplified the model as 2D and as stationary.
2. considered as symmetry that the model and boundary conditions are symmetry.
3. split as 3 bodies and then created as a whole body.
4. I have the temperature and heat flux density as results
My goal now is that I determine thermal resistance in relation to distance a.
the thermal resistance is defined as follows:
all three factors are known, can i determine a relationship between thermal resistance and distance a? by Design of experoiement in Ansys?
Input : a
Output : R
but how can I define R in Ansys?
These are the temperature distribution and heat flux.
November 24, 2019 at 12:48 ampeteroznewmanSubscriber
I'm confused, why is the highest temperature in the cooling line? I thought that the cooling line was supposed to be the coolest part of the tool, not the hottest.
November 24, 2019 at 7:51 pm
November 25, 2019 at 1:27 pmpeteroznewmanSubscriber
In the image at the top, the cooling pipes are defined with a dimension B and C.
Please show an image that illustrates the input distance a.
The equation you show is typically used in a 1D analysis. The variable A in that equation is the cross-sectional area of the 1D analysis. q_dot is heat flux so q_dot*A = heat flow along the 1D direction. How do you want to apply that in 2D?
November 25, 2019 at 2:33 pm
November 25, 2019 at 6:37 pm
November 25, 2019 at 9:05 pmJackelySubscriber
yes is with me a the distance.
The goal is not geometry optimization, but a comparison between round and square channels.
about round channels are already a lot of research done, but square channels not so many.
Therefore I would like to compare a relation between distance a and thermal resistance to compare it later with round channels.
I'm going to read some books on heat flux to understand that.
November 25, 2019 at 9:32 pmpeteroznewmanSubscriber
axx? What happened to a?
November 25, 2019 at 11:37 pmJackelySubscriber
Oh, sorry, I just mistyped.
I got confused.
I corrected it.
November 26, 2019 at 12:48 ampeteroznewmanSubscriber
If the diameter of a round channel is d, the surface area is Ar = 3.1416*d per unit depth of tool.
If the side length of a square channel is h, the surface area is As = 4*h per unit depth of tool.
Are you going to compare the heat transfer by making d = h or are you going to adjust h so that Ar = As?
November 26, 2019 at 12:17 pmJackelySubscriber
No I will not use the geometric equivalent diameter, but hydraulic diameter ( to make a fair comparison between round and square shape)
but in this case hydraulic diameter for both gemetries is the same, because the dimensions of rectangular channel are 10*10 mm.
in this page it will be clarified well.
November 26, 2019 at 1:50 pmpeteroznewmanSubscriber
The hydraulic diameter of a pipe of diameter d is d.
Equal hydraulic diameter means you are going to make the side of the square equal to the diameter of the circle.
Without any simulation, just based on the larger surface area, the square is going to have a higher heat flow, and result in a lower temperature than the round cooling channel.
November 26, 2019 at 10:40 pmJackelySubscriber
I'll do it without simulation.
November 27, 2019 at 12:23 pmpeteroznewmanSubscriber
Okay, please mark one of my posts above with Is Solution so the Discussion can be marked as Solved.
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Solver Pivot Warning in Beam Element Model
- Saving & sharing of Working project files in .wbpz format
- Understanding Force Convergence Solution Output
- An Unknown error occurred during solution. Check the Solver Output…..
- What is the difference between bonded contact region and fixed joint
- User manual
- The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
- whether have the difference between using contact and target bodies
- material damping and modal analysis
- Colors and Mesh Display
© 2023 Copyright ANSYS, Inc. All rights reserved.