[SS2S-Main] Re: Cfd simulation

  • From: Vicente Alvero Zambrano <vicente_alvero_14@xxxxxxxxxxx>
  • To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
  • Date: Thu, 31 Jul 2014 19:41:31 +0200

That would be great. The nosecone has a 274 mm diameter and a length 1507 mm. 
With a powet of 0.75. Anyway, in the coming days will send you a drawing

> El 31/07/2014, a las 18:50, "Hans Olaf Toft" <hot@xxxxxxxxxxxxx> escribió:
> 
> I have a software implementation of this method. I have never tried doing a 
> profile of an entire nosecone though, but if You send me a drawing of the 
> nosecone where I can see the thickness and material, I will do the sim. Could 
> be interesting to compare with CFD snapshots.
> 
> Hans
>> On 07/31/2014 04:43 PM, Vicente Alvero Zambrano wrote:
>> Hi Hans,
>> I have read a bit over this report. I find it a great job. Do you think that 
>> it is possible to do a calculation sheet or fortran program to have data? 
>> Anyway, I'd like to also do a cfd simulation to have image.
>> What do you think? 
>> 
>> Cheers
>> 
>> El 31/07/2014, a las 12:06, "Hans Olaf Toft" <hot@xxxxxxxxxxxxx> escribió:
>> 
>>> There were previously made some thermal simulations for MiniSShot. Although 
>>> it is a worthy effort to produce flow simulations around a nosecone they 
>>> are not really useful for calculating the true thermal load on the 
>>> structure as they show the static temperature field corresponding to flying 
>>> at a particular velocity infinitely.
>>> 
>>> Calculation of skin temperature requires calculation of the heat flux into 
>>> the structure, the radiation to the universe and knowledge of the heat 
>>> capacity of the structure. One will have to solve the dynamic heat problem, 
>>> so the CFD You are looking for must be able to replicate the velocity 
>>> profile and solve for the accumulated surface temperature - or - You would 
>>> have to do a large number of static calculations and then use them as input 
>>> for the calculation of skin temperature.
>>> 
>>> I suggest using the method of NACA Technical Note 1725, that enables a 
>>> simplified calculation of the skin temperature of a conical body. Repeated 
>>> calculations assuming little or no             transversal heat flow could 
>>> then give an estimated thermal load of the nosecone *except* the apex for 
>>> which the model does not apply. CFD calculations will tend to give an upper 
>>> boundary of the skin temperature, so this could possibly be used for the 
>>> dimensioning the apex heat capacity.
>>> 
>>> Hans
>>> 
>>>> On 07/31/2014 11:13 AM, Lampe, Mattias SLC CT PEK wrote:
>>>> Hi Vicente,
>>>> 
>>>>  
>>>> 
>>>> as far as I know, there is some Open Source Software that could possibly 
>>>> perform this kind of simulations (e.g. OpenFOAM), but it takes quite a bit 
>>>> of expert knowledge (on fluid dynamics AND on numerical simulation 
>>>> methods) to get any meaningful results out of such software.
>>>> 
>>>>  
>>>> 
>>>> A  fast PC would probably be sufficient for the number crunching, so what 
>>>> you really need is someone with a solid background in fluid dynamics and 
>>>> practical simulation experience.
>>>> 
>>>>  
>>>> 
>>>> Mattias
>>>> 
>>>>  
>>>> 
>>>> From: sugarshot-bounce@xxxxxxxxxxxxx 
>>>> [mailto:sugarshot-bounce@xxxxxxxxxxxxx] On Behalf Of Vicente Alvero 
>>>> Zambrano
>>>> Sent: Thursday, July 31, 2014 4:57 PM
>>>> To: sugarshot@xxxxxxxxxxxxx
>>>> Subject: [SS2S-Main] Re: Cfd simulation
>>>> 
>>>>  
>>>> 
>>>> That is perfect. Can you do it? If you want, I can give you technical 
>>>> drawings and data information to the simulation. What do you think? 
>>>> 
>>>> 
>>>> El 30/07/2014, a las 22:01, "Nathan Asdourian" <rawliquid@xxxxxxxxx> 
>>>> escribió:
>>>> 
>>>> I likely have sufficient computing power, unless it requires a server farm.
>>>> 
>>>> I also know enough about computers to likely get whatever software is 
>>>> needed running, but I certainly don't know enough to do it, nor do I have 
>>>> the software. If anyone has those two things but lacks the resources to do 
>>>> it, let me know and I can get you access to my system.
>>>> 
>>>>  
>>>> 
>>>> On Wed, Jul 30, 2014 at 12:10 PM, Vicente Alvero Zambrano 
>>>> <vicente_alvero_14@xxxxxxxxxxx> wrote:
>>>> 
>>>> Yes, two things. We need a complete simulation.
>>>> 
>>>> 
>>>> El 30/07/2014, a las 19:23, "Nathan Asdourian" <rawliquid@xxxxxxxxx> 
>>>> escribió:
>>>> 
>>>> I assume this means you are looking for someone that knows how to do it 
>>>> rather than just computing resources?
>>>> 
>>>> 
>>>> 
>>>>  
>>>> 
>>>> -- 
>>>> I respectfully decline the invitation to join your hallucination.
>>>> 
> 

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