Temperature

Yassinez · June 9, 2018, 16:29

I have a simple domain 2D; the inlet is pipe (8mm) in a domain of 4m² (pressure outlet), I want the air coming into the domain to have a temperature of 340kelvin, Can someone please tell me how to do that? everythingelse is ambiant.

Noix_V · June 9, 2018, 21:27

You mean that the inlet fluid has a set temperature? Just enable the energy equation, then choose the "Thermal" tab on your inlet border condition and set the value you want.

Yassinez · June 10, 2018, 16:16

the problem is the domain tepmerature, I want the domain to be at the ambiant temperature so that i can see the domain heating up. boundaries are all pressure outlet

Cyrus69 · June 10, 2018, 17:08

hi
as i understand, u have a pipe as an inlet that push the air to ur domain(4m^2)
.is that correct?
if yes there's no temp diffrence.if theres a temp diffrence in ur problem, send a sketch from ur geomtry and conditions.

Yassinez · June 10, 2018, 17:24

Here is a sketch,

Cyrus69 · June 10, 2018, 19:07

what r ur datas?
1-what's the speed and temp of inlet air?(properties of inlet air)
2-are ur walls inulated or not? if not what's the properties?

LuckyTran · June 11, 2018, 10:59

This is a transient problem. You want to set the air inlet temperature to be 340K as a boundary condition.

For the ambient air in the domain, you want to set its initial temperature (at say time = 0s) to be 300K. You set this in the initialization.

Yassinez · June 11, 2018, 12:08

the velocity in the inlet is 5m/s
temperature is 340k
the boundaries are not WALLS their set to PRESSURE OUTLET
please help.

RaiderDoctor · June 11, 2018, 12:17

I think LuckyTran gave you your answer. Initialize the domain as the ambient temperature using Standard Initialization methods. Then model your case as a transient study with the inlet set to what you previously described.

Yassinez · June 11, 2018, 12:45

I use hybrid initialization

RaiderDoctor · June 11, 2018, 12:53

If you use hybrid initialization, you will not be able to set the domain temperature. It will instead interpolate it from the inlet temperature, which is not what you want. Using Standard Initialization, under the Initial Values, set the temperature to whatever you need it to be set to initially. As you simulate, the change in temperature will be calculated from you inlet.

June 9, 2018, 16:29	Temperature	#1
Yassinez New Member yassin iledaf Join Date: Jun 2018 Posts: 5 Rep Power: 9	I have a simple domain 2D; the inlet is pipe (8mm) in a domain of 4m² (pressure outlet), I want the air coming into the domain to have a temperature of 340kelvin, Can someone please tell me how to do that? everythingelse is ambiant.

June 9, 2018, 21:27		#2
Noix_V New Member Noix Join Date: May 2018 Posts: 13 Rep Power: 9	You mean that the inlet fluid has a set temperature? Just enable the energy equation, then choose the "Thermal" tab on your inlet border condition and set the value you want. Yassinez likes this.

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June 10, 2018, 16:16		#3
Yassinez New Member yassin iledaf Join Date: Jun 2018 Posts: 5 Rep Power: 9	the problem is the domain tepmerature, I want the domain to be at the ambiant temperature so that i can see the domain heating up. boundaries are all pressure outlet

June 10, 2018, 17:08		#4
Cyrus69 New Member Join Date: May 2018 Posts: 20 Rep Power: 9	hi as i understand, u have a pipe as an inlet that push the air to ur domain(4m^2) .is that correct? if yes there's no temp diffrence.if theres a temp diffrence in ur problem, send a sketch from ur geomtry and conditions.

June 10, 2018, 19:07		#6
Cyrus69 New Member Join Date: May 2018 Posts: 20 Rep Power: 9	what r ur datas? 1-what's the speed and temp of inlet air?(properties of inlet air) 2-are ur walls inulated or not? if not what's the properties?

June 11, 2018, 10:59		#7
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,845 Rep Power: 68	This is a transient problem. You want to set the air inlet temperature to be 340K as a boundary condition. For the ambient air in the domain, you want to set its initial temperature (at say time = 0s) to be 300K. You set this in the initialization.

June 11, 2018, 12:08		#8
Yassinez New Member yassin iledaf Join Date: Jun 2018 Posts: 5 Rep Power: 9	the velocity in the inlet is 5m/s temperature is 340k the boundaries are not WALLS their set to PRESSURE OUTLET please help.

June 11, 2018, 12:17		#9
RaiderDoctor Senior Member Join Date: Dec 2016 Posts: 152 Rep Power: 12	I think LuckyTran gave you your answer. Initialize the domain as the ambient temperature using Standard Initialization methods. Then model your case as a transient study with the inlet set to what you previously described.

June 11, 2018, 12:45		#10
Yassinez New Member yassin iledaf Join Date: Jun 2018 Posts: 5 Rep Power: 9	I use hybrid initialization

June 11, 2018, 12:53		#11
RaiderDoctor Senior Member Join Date: Dec 2016 Posts: 152 Rep Power: 12	If you use hybrid initialization, you will not be able to set the domain temperature. It will instead interpolate it from the inlet temperature, which is not what you want. Using Standard Initialization, under the Initial Values, set the temperature to whatever you need it to be set to initially. As you simulate, the change in temperature will be calculated from you inlet.