# Yifeng Tang

### MathWorks

Last seen: 1 day ago Active since 2020

Followers: 0   Following: 0

Programming Languages:
Python, MATLAB, Fortran
Spoken Languages:
English, Chinese
Pronouns:
He/him
Professional Interests:
Physical Modeling, Simscape Fluids, Simscape, Heat and Mass Transfer, Thermodynamics and Heat Transfer

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why are the results different from moist air domain(MA) using only dry air and gas domain(G)? - simscape
Hello, Given the range of temperature you'd like to implement, I believe you are seeing the difference in the way the specific ...

7 days ago | 1

The sum of the 2 branches flow is different than pump flow
Hi Flavio, I looked at the model and below are my observations. the parameters and inputs for the pump look ridiculous: at 1m^...

8 days ago | 2

| accepted

Simscape 4-Way 3-Position Directional Valve (IL) No "Fluids/Plot Valve Characteristics" Option
See the comment section for the discussion. Issue resolved (by itself) as of now.

14 days ago | 0

Pipe (TL) fluid compressibility problem
See this related question for a more detailed discussion: https://www.mathworks.com/matlabcentral/answers/2111661-rservoir-tl

1 month ago | 0

| accepted

Rservoir (TL)
Hi Karim, I did a few things that feel like best practices to me: (1) add a Tank (TL) block to where the reservoir was. Pleas...

1 month ago | 0

| accepted

Heat Exchanger (TL-TL) breaking thermodynamics?!
This shouldn't happen for parallel-flow heat exchangers, because of 2nd law of thermo-dynamics. But this may happen for counter...

2 months ago | 1

| accepted

hydraulic circle for fire suppression system clean agent
Hi Albara, It will be helpful if you could provide some schematic to show the interior of the agent tank so we can understand t...

2 months ago | 0

Simscape Gas Inertia block
Hi Caleb, "Fluid inertia is negligible." is one of the model assumption of the Pipe (G) block. You may be able to modify the c...

2 months ago | 0

Simscape fixed displacement pump pressure gain wrong?
Hi Sandro, one quick thing to fix: you need another reservoir at port B, otherwise the fluid has nowhere to go. The reservoir a...

2 months ago | 0

Modeling a pressurized flexible body (balloon) in simscape multibody/fluids
Hi Siril, I feel the problem may be way more complicated than just "the two open red open wires". To model this pressurized fl...

2 months ago | 0

| accepted

Isothermal Fluids Pump/Motor Case Drain
Hi Philip, I feel the way you model it is very reasonable. Adding an small orifice or check valve mimics what happens in real ...

2 months ago | 0

Changing Thermal Liquid Properties in Simscape
If you'd like to manually set the properties like density, Cp, etc., the right block to use is "Thermal Liquid Settings (TL)" fr...

3 months ago | 0

Failed to increase pressure of a system with an actuator. Whats wrong?
It looks like that you would like to move the piston & mass so the pressure in Chamber A of the actuator will increase and you a...

3 months ago | 0

| accepted

Simscape piston moves without pressure difference
You don't need a force to keep a mass moving at constant velocity, as the acceleration is zero and F=m*a. When I add a damper...

3 months ago | 0

| accepted

Simscape pipe cleaning model - cleaning used pipe's interior surface with different fluid
It's possible to model a "solution", i.e. thermal liquid + passive scalar(s), using a quick-and-dirty way or a more formal one. ...

3 months ago | 0

simulation of a gas network node
It should be quite straightforward to build something like this: Just like how you draw that on paper. Simscape Onramp can b...

3 months ago | 1

What is the mistake in the simulation, if the transient initialization at time x, solving for consistent states and modes, failed to converge?
Hi Emefun, It looks like the piston side of your hydraulic cylinder doesn't have any mass. Adding a mass block to the rod allo...

3 months ago | 1

| accepted

False Results SIMSCAPE Pipe Block for cooling air stream
Hi Bastian, It sounds like in the simulation, the air stream is taking away less heat than in the test, resulting in a higher e...

4 months ago | 0

Li-ion battery pack cooling using Phase changing material
Hi Chinmaya, This will involve some customization in Simscape language. The simpliest implementation is to make a custom block...

4 months ago | 0

Simscape: Fan (MA) behavior with higher external flow
Hi Fabian, Check out this example: https://www.mathworks.com/help/hydro/ug/sscfluids_ev_thermal_management.html In the radiato...

4 months ago | 0

Temperature varying input for reservoir in refrigeration cycle
Use a Controlled Reservoir (MA) block. https://www.mathworks.com/help/releases/R2023b/simscape/ref/controlledreservoirma.html ...

4 months ago | 0

Centrifugal Pump doesnt increase pressure in Simscape for 2P-Fluid
Hi ÖMER, Two things I did to make the "Comminityfrage.slx" model to produce reasonable results. At the pump, make the max head...

4 months ago | 0

| accepted

Simulink: Adding expansion valve and try to close the refrigerant loop but fail to converge with initial conditions
Hi Brendon, I'm concerned that the way you are taking heat out of the condenser may generated unintended consequences and make ...

5 months ago | 0

How is the correct heat transfer equation in the Simscape block "Pipe (TL)"?
The temperature at the outlet port will be the same as the temperature inside the pipe. So usually either T_A or T_B will be th...

5 months ago | 0

Tutorials on Two Phase Fluid models?
In Simscape Fluids, there is an example/tutorial on how to build one of the shipping example on refrigeration step by step. h...

5 months ago | 0

How can i plot P-H Diagram with two parameter are: Pressure and Temperature( With refrigerantion system)?
Hi Trieu, For points outside the vapor dome, P & T uniquely determine the state. You may use Reservoir (2P) or Controlled Rese...

5 months ago | 0

How to model combustion chamber or heater for gas turbine system using Simulink?
Hi Kheng, For this application, I would highly recommend that you use Simscape and Simscape Fluids for your physical modeling. ...

5 months ago | 0

Simscape Thermal Liquid Domain - Across variable T of parallel flows
Adding a pipe block after each of the custom components will work just fine as well. Indeed, ALL ports connected to the same ju...

5 months ago | 0