Learning Forum

[ayodele1]

Dear ANSYS,nI am to simulate the flow of an hot fluid from a reservoir to a pump at a distance >20 meters. The working temperature of the fluid is about 190 degrees C. I am familiar with the standard flow simulation to visualize the flow field from the velocity and pressure contours. I am however a rookie on hot fluid flow simulation.nPlease how do I formulate the flow to include temperature of the fluid and be able to visualize temperatures at points of interest, as well as pressures and velocities of the flow?nThe flow domain is about 24 meters long and a nominal diameter of 0.6 meters. I plan to model the domain as axisymmetric, and equally split up the domain into lengths, so as to apply outlet value(s) from previous simulation as inlet for the next, until I obtain the parameters of interest at the end point. Please is this arrangement alright, or there is an optimal way of working with this long asymmetric length of the domain?nThe domain includes bends, contractions and valves. I wanted to simulate on 2D; however, unsure as to how to work through the bends. Please is there a way around this, does this have to be a 3D simulation?nMany thanks for your anticipated guidance.nAyodele1. n

[YasserSelima]

From models, Enable the energy equation. Then you will be able to enter temperatures from the thermal tab. Axisymmetric works if you cam ignore the gravity, or if your pipe is vertical ... I believe you will not be able to do axisymmetric simulations with elbows as the axis should be one line along the x direction (not sure about this)n

[ayodele1]

Thanks for your response.nI have checked the Energy button under Models, and was not taken to the thermal lab to enter the temperatures. Please how am I suppose to do this?nSecondly, will I also need to select the turbulence model?nAs the flow is turbulent, my thinking is that the turbulence model may still be required. Please is this correct, or not required actually? nThanks for your support.nAyodele1.n

[YasserSelima]

After you enable the energy, you will find the thermal tab available when you enter the boundary conditions. For example, at the inlet boundary conditions, you will find at the top, a tab called thermal. Here you can enter temperature of the fluid going in.nnFor the turbulence, Under models, double click viscous, and select a turbulence model.n

[ayodele1]

Thanks a lot for your response. I now can see the the thermal tab and able to enter the temperature. I have entered 273k (0 degree C) as part of my pressure-outlet boundary condition, and 463k (190 degrees C) as part of my velocity-inlet b.c. Please is this how I should enter the temperature condition? nI was wondering if there're examples of similar setup to this from which I could learn about this type of flow physics further. Is there any you can share or direct me to?nThanks for your support.nAyodele1. n

[YasserSelima]

check thisnhttps://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/flu_tg/flu_tg_elbow_mesh_wtc.htmln

[Rob]

I'd advise clicking on Help and doing some tutorials, and do the courses from the menu at the top of the page. As has noted, axi-symmetric won't let you model elbows and 2d isn't ideal for pipes as it assumes a rectangular channel 1m thick. Have a very careful think about what you're trying to model and why before switching on the software. nFor heat transfer setting the outlet temperature is only if you have back flow, otherwise the flow will enter at 190C and leave at 190C if you don't set anything else. If the system is turbulent that needs setting, at least in the more recent versions k-w is on by default. n

[ayodele1]

check thishttps://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/flu_tg/flu_tg_elbow_mesh_wtc.html/forum/discussion/comment/102577#Comment_102577

Thank you @YasserSelima, . The link demanded that I enter customer log-in details which I do not have yet. Are there other options?nAyodele1.n

[YasserSelima]

start fluent, then use the help button at the top right question mark ... it will open your browser. Copy the link and paste it in the same browser page. It should work.n

[ayodele1]

Thanks a ton.nI have just done that, and it worked. I will go through it immediately.nThanks immensely.nAyodele1.n

[YasserSelima]

Good luck!n

[ayodele1]

Dear ANSYS,nPlease can you advice me on what parameter I should setup for surface report definition, given that the flow will enter and leave the domain at 190C?nIs flow rate appropriate to be used for the surface report definition?nThank you in anticipation.nAyodele Adeyemin n

[ayodele1]

Dear ANSYS,nPlease can you advice me on what parameter of the flow simulation for hot fluid that I should setup for surface report definition, given that the fluid will enter and leave the domain at 190C, without any form of heat transfer?nI was wondering if flow rate will be appropriate?nKindly advise.nThank you in anticipation.nAyodele Adeyemin n

[ayodele1]

Dear ANSYS,nI wanted to know which of the parameters of this hot fluid flow (@ 190C) I should setup for surface monitor. There is no flow mixing, there is just one fluid flow through the pipe section. I do not think temperature will be appropriate, and considering flow rate instead. nPlease can you advise me on the parameter to use as surface monitor for the flow simulation.nThanks in anticipation.nAyodele1 n

[ayodele1]

Dear ANSYS,nI wanted to know which of the parameters of this hot fluid flow (@ 190C) I should setup for surface monitor. There is no flow mixing, there is just one fluid flow through the pipe section. I do not think temperature will be appropriate, and considering flow rate instead. nPlease can you advise me on the parameter to use as for surface monitor for the flow simulation.nThanks in anticipation.nAyodele1 n

[YasserSelima]

What do you want to calculate from the simulation? n